a. A reference electrode is a half-cell with a known and stable electrode potential. It serves as a comparison point for measuring the potential of other electrodes in the experiment, providing a basis for determining the cell potential.
b. A reduction half-reaction is the process in which a chemical species gains electrons, thereby reducing its oxidation state. This reaction occurs at the cathode, where the species accepts electrons from the external circuit.
c. A salt bridge is a device that connects the two half-cells of an electrochemical cell, allowing the flow of ions between them. It is needed to complete the electrical circuit, enabling the flow of electrons and allowing the redox reaction to occur.
d. The cell potential is the measure of the difference in electrical potential between the anode and cathode in an electrochemical cell.
a. A reference electrode is a device that provides a stable and reproducible voltage that can be used as a reference point for measuring the potential difference between two electrodes in an electrochemical cell. A reference electrode is typically made of a metal and its corresponding salt solution with a fixed concentration and pH. The most commonly used reference electrode is the standard hydrogen electrode (SHE), which has a potential of 0 volts.
b. Reduction half-reaction is a type of electrochemical reaction that involves the gain of electrons by a species. In other words, it is a reaction where a species accepts one or more electrons and is reduced. In an electrochemical cell, reduction half-reactions take place at the cathode, where electrons are gained.
c. A salt bridge is a device used in electrochemical cells to connect the two half-cells and allow the flow of ions between them. The salt bridge is filled with an electrolyte solution, usually salt, that contains mobile ions. The salt bridge is needed because, without it, the electrochemical reaction would quickly come to a stop due to a buildup of charge and a lack of ions to balance the charge.
d. Cell potential, also known as electromotive force (EMF), is the measure of the potential difference between two half-cells in an electrochemical cell. It is the driving force behind the flow of electrons in a cell. The cell potential is measured in volts and is calculated by subtracting the reduction potential of the anode from the reduction potential of the cathode. The higher the cell potential, the greater the driving force for the electrochemical reaction.
In summary, a reference electrode provides a stable voltage that is used as a reference point, reduction half-reaction involves the gain of electrons by a species, a salt bridge is needed to allow the flow of ions between the two half-cells and cell potential is the measure of the potential difference between two half-cells.
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In a third experiment, 0.10 g samples of Mg(s) are placed in excess HCl(aq) of various concentrations:
0.050 M, 0.10 M, 0.25 M, and 0.50 M. The reactions are run in successive order from 0.050 M to
0.50 M, and the time required for each reaction to go to completion is recorded. As the concentration of HCl(aq)
increases from 0.050 M to 0.50 M, which of the following is the expected result?
(A), The reaction time increases, and the rate of the reaction decreases.
The reaction time decreases, and the rate of the reaction increases.
(C) Both the reaction time and the rate of the reaction increase.
(D) Both the reaction time and the rate of the reaction decrease.
+2H30+ H₂AsQ₂ + 1₂ + H₂O
The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is: (B) The reaction time decreases, and the rate of the reaction increases.
What is the expected result?An aqueous solution of hydrogen chloride is what is known as hydrochloric acid, also referred to as muriatic acid. It has an unmistakably strong odor and is colorless. It is categorized as a powerful acid. It is a part of the gastric acid in most animal species' digestive systems, including humans.
The expected result as the concentration of HCl(aq) increases from 0.050 M to 0.50 M is that the reaction time decreases, and the rate of the reaction increases. This is because as the concentration of the acid increases, the number of acid molecules in the solution increases and therefore the number of collisions between acid molecules and magnesium increases. This leads to more frequent and successful collisions and a faster rate of reaction.
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what is the word equation for CS2(1)+3O2(g)->CO2(g)+2SO2(g)
Answer:
liquid carbon disulfide and oxygen gas produce carbon dioxide gas and sulfur dioxide gas
Explanation:
Next, the chemist measures the volume of the unknown liquid as 1870. cm³ and the mass of the unknown liquid as 1.17 kg.
Calculate the density of the liquid. Round
your answer to 3 significant digits.
Given the data above, is it possible to
identify the liquid?
If it is possible to identify the liquid, do so.
gmL
yes
no
dimethyl sulfoxide
pentane
carbon tetrachloride
glycerol
tetrahydrofuran
X
5.
Answer:
The density of any given liquid is equivalent to the mass of the liquiddivided by the volume of the liquid.From the given information, we have:The mass of the unknown liquid to be = 972 gThe volume of the unknown liquid to be = 0.610 L = 610 cm³If the formula for calculating Then;The Density of the unknown liquid ≅ 1.593 g/cm³In conclusion, the density of the unknown liquid is 1.593 g/cm³ to 3 significant figures.
Explanation:
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What are the four types of verbal irony?
The four types of verbal irony are verbal irony, sarcasm, innuendo, and hyperbole.
Verbal irony is the intentional use of words to express something different from what is said. It is a figure of speech often used for comedic effect, to emphasize a point or to add emphasis.
Sarcasm is a type of verbal irony that is used to mock, ridicule, or criticize someone. Innuendo is a type of verbal irony that implies a hidden meaning or suggests something without directly saying it.
Finally, hyperbole is an exaggerated statement used in an attempt to make a point or to emphasize something. All four types of verbal irony can be used to make a point more effectively or to add humor to a conversation.
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These pea plants have been in the sunlight since early morning.
What can the pea plants do because they are in sunlight? What does this mean for the number of energy storage molecules in the pea plants?
Pea plants uses the light energy from sun for photosynthesis and they synthesis chemical energy in leaves.
What is photosynthesis ?Photosynthesis is a biochemical process taking place in green plants to synthesis energy with the aid of light energy. The green pigments chlorophyll absorbs enough light energy for this biochemical reactions.
The photosynthetic reaction is the reaction between water and carbon dioxide producing glucose and oxygen. Thus, this process intakes carbon dioxide that we exhale and release oxygen that aids our respiration.
Pea plants are green plants undergoing photosynthesis. They uses light energy to produce chemical energy. With the presence of sunlight, they can easily carry photosynthetic reaction in leaves.
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What is the term for the chromosomes that are identical after DNA replication?
Sister chromatids is the term for the chromosomes that are identical after DNA replication.
Sister chromatids are identical chromosomes that are created during the process of DNA replication. DNA replication is the process where a DNA strand is copied, creating a new strand. During this process, each chromosome is split in half, forming two identical halves.
These halves are known as sister chromatids and are held together by a centromere. Sister chromatids are attached to one another during the interphase stage of the cell cycle and are separated during the metaphase stage of the cell cycle.
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A 0.32 m aqueous solution of an unknown solute has a density of 1.08 g/ml. the molar mass of the solute is 146.8 g/mol. What is the molality of this solution?
According to molar concentration , the molality of the solution up to second decimal place is 0.31 m.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion.molarity = 0.32 mol of solute / 1 L solution.To find kg of solute-0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg. To find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution. To find kg of solvent: 1.08 kg solution - 0.046976 kg solute = 1.033 kg water.Thus, molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kgThus, molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kgTo learn more about molar concentration refers to:
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According to molar concentration, the molality of the solution up to second decimal place is 0.31m.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution. Most commonly used unit for molar concentration is moles/liter. The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion.
The use of molarity.Understanding a solution's molarity is important since it allows you to determine the actual concentration as well as whether the solution is diluted or concentrated. Measures of solution concentration include molality and molarity.
Determination of molality:Molarity = 0.32 mol of solute / 1 L solution.
To find kg of solute-0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg.
To find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution.
To find kg of solvent: 1.08 kg solution - 0.046976 kg solute = 1.033 kg water.
Thus, molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kg
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Explain why the atomic radius of hydrogen is so much smaller than that the atomic radius for potassium.
Choose the correct condensed structure from the name: hexene.
O CH3CHCHCHCH3
O CHCCH2CH3
O CH3CH2CH2CH2CH2CH3
O CH3CH2CHCHCH2CH3
The correct condensed structure of hexene is CH₃CH₂CH=CHCH₂CH₃.
A condensed structural formula also termed as semi-structural formula and it is used to describe the organic compounds in a line of text. They will be illustrated in a single line of text and specifies the atoms in the order which are located in a molecule.
Hexene is a hydrocarbon having chemical formula C₆H₁₂. It s used as a comonomer in the production of the polyethylene. There are several number of isomers in hexene, depending on the geometry and position of the double bond in the chain. One of the most common useful of isomers is 1-hexene as well as an alpha-olefin.
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What would a liquid at 50 degrees Celsius. I want to know it’s melting and boiling point.
A liquid at 50 degrees Celsius would have a melting point of 50 degrees Celsius and a boiling point of approximately 173.15 degrees Celsius.
What is the liquid?
iquid is a state of matter that has a definite volume, but does not have a fixed shape. It is one of the four fundamental states of matter, along with solid, gas, and plasma. Liquids tend to have a greater volume than solids, but geneLrally take the shape of their container. Examples of liquids include water, milk, blood, gasoline, and oil. Liquids are composed of molecules that tend to have greater mobility and can easily flow past each other. Depending on the temperature, pressure, and composition of the liquid, it can undergo changes in the state of matter.
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what is the percent composition of hcl by numbers of atoms?
Answer:
H is 2.74%
Cl is 97.24%
Explanation:
HCl molar mass is 36.458
H is 1 so 1/36.458 is .0274 or 2.74 percent
Cl is 35.453 so 35.453/36.458 is .9724 or 97.24 percent
The Coriolis effect is the deflection of moving objects from a straight path due to Earth's rotation. Which of the following is the result of the Coriolis effect?
The result of the Coriolis effect is the rotation of the earth on its axis. So the correct option is B.
What is the Coriolis effect?The Coriolis effect is a type of force to which the fluids of the earth are exposed. It is the acceleration they receive due to the rotation of the earth, what is generated is a deviation in their trajectory which now causes their trajectory to be curved. This force it is exposed to is called the coriolis force, but it is not a real force since there is nothing pushing on it.
The acceleration to which the fluids are exposed will be perpendicular to the axis of rotation of the earth and to the components of its velocity.
Therefore, we can confirm that the correct option is B. the rotation of the earth on its axis.
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The Coriolis effect is the result of which of the following?
A. winds spinning off the equator
B. the rotation of the earth on its axis
C. the different air movements north and south of the equator
D. the friction that slows down winds near the earth’s surface
A 0.1 m solution is diluted by three orders of magnitude. what is the new concentration?
So the new concentration of the solution is 0.0001M.
What is magnitude?A magnitude is the measurement or absolute value of a quantity. A magnitude is represented by a positive real number. Put simply, a magnitude is the size of some quantity. For example, the magnitude of an earthquake, measured on the Richter scale, usually varies between 1 and 10 and represents the size of the earthquake. An earthquake with a magnitude of 8 is much more trouble than an earthquake with a magnitude of 3.The magnitude of a number, unlike the magnitude of a physical quantity, is not relative to a scale or set of units: the magnitude of 100 is 100. By contrast, the magnitude of a ruler is 12 in inches but is 30.48 in centimeters. Outside of pure mathematics one has to be careful to specify the units in which the magnitude of some quantity is measured.To learn more about magnitude refer to:
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REPORT SHEET EXPERIMENT Colorimetric 22 Determination of an Equilibrium Constant in Aqueous Solution A. Preparation of the Calibration Curve Concentration of Fe(NO) in 0.10 MHNO3 solution O 2 M Concentration of NaSCN in 0.10 M Nos solution 0.002 M Flask Number volume of NascN, mL O Solution Initial [SCNT], M x 10-5 Equil. [FeNCs: MM Percent T 13.2 21.2. Absorbance 0.412. B. Determination of the Equilibrium Constant Concentration of Fe(NO3)3 in 0.10 MHNOn solution 0.002 M. Concentration of NasCN in o.10 M HNo, solution 0.002 M. Test Tube Number Solution Temperature Volume of Fe (NO3, 5 Solution, mL Volume of NaSCN Solution, mL Initial [Fe M 0.00 0.001 0.001 0.001 0.001 0.001 8.0x10 0.001 Initial [SCN 1. M 293
The Equilibrium Constant Concentration of Fe(NO3)3 is Keq 2.79*10^2 and molar extinction coefficient is 4438 L/mol.
Slope of the above calibration curve represents molar extinction coefficient in L/mol for Fe(SCN)2+.
Hence
= 4438 L/mol
B. Determination of K:
Test tube-2: A = 0.193
=> [Fe(SCN)2+]eq = A /
b = 0.193 / 4438 L/mol x 1 = 4.35x10-5 M
[Fe3+]eq = 0.001 - 4.35x10-5 M = 9.565x10-4 M
[SCN-]eq = 2.0x10-4 M - 4.35x10-5 M = 1.565x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 4.35x10-5 M / ( 9.565x10-4 Mx1.565x10-4 M) = 2.91x102
Test tube-3: A = 0.331
=> [Fe(SCN)2+]eq = A /
b = 0.331 / 4438 L/mol x 1 = 7.46x10-5 M
[Fe3+]eq = 0.001 - 7.46x10-5 M = 9.254x10-4 M
[SCN-]eq = 4.0x10-4 M - 7.46x10-5 M = 3.254x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 7.46x10-5 M / (9.254x10-4 Mx3.254x10-4 M) = 2.48x102
Test tube-4: A = 0.512
=> [Fe(SCN)2+]eq = A /
b = 0.512 / 4438 L/mol x 1 = 1.15x10-4 M
[Fe3+]eq = 0.001 - 1.15x10-4 M = 8.85x10-4 M
[SCN-]eq = 6.0x10-4 M - 1.15x10-4 M = 4.5x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 1.15x10-4 M / (8.85x10-4 Mx4.5x10-4 M) = 2.89x102
Test tube-5: A = 0.634
=> [Fe(SCN)2+]eq = A
b = 0.634 / 4438 L/mol x 1 = 1.43x10-4 M
[Fe3+]eq = 0.001 - 1.43x10-4 M = 8.57x10-4 M
[SCN-]eq = 8.0x10-4 M - 1.43x10-4 M = 6.57x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 1.43x10-4 M / (8.57x10-4 Mx6.57x10-4 M) = 2.54x102
Test tube-6: A = 0.890
=> [Fe(SCN)2+]eq = A /

b = 0.890 / 4438 L/mol x 1 = 2.01x10-4 M
[Fe3+]eq = 0.001 - 2.01x10-4 M = 7.99x10-4 M
[SCN-]eq = 0.001 M - 2.01x10-4 M = 7.995x10-4 M
Keq = [Fe(SCN)2+]eq / ([Fe3+]eq x [SCN-]eq)
=> Keq = 2.01x10-4 M / (7.99x10-4 Mx7.99x10-4 M) = 3.15x102
Average Keq
= (2.91x102 +2.48x102 +2.89x102 +2.54x102 +3.15x102 ) / 5
= 2.79x102
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How many mL of a 2.63 M solution do you need to dilute to 100 mL with a final concentration of 0.48
Answer is= 18.25/ How?
18.25 mL of a 2.63 M solution you need to dilute to 100 mL with a final solution concentration of 0.48.
The amount of a substance is often measured by how much it weighs – i.e. in g or mg or kg etc. The concentration is the amount divided by the volume it is dissolved in. concentration = amount divided by volume
Another way of representing the amount of a substance is to use the concept of mole. A mole is simply 6.0223 x 1023 molecules (this is “Avogadro’s number”)
Eggs come in dozens (12), molecules come in moles (6 x 1023) The mass of a mole of molecules is the formula weight in grams. This is sometimes called “molar mass” with symbol M. Sometimes it is referred to as molecular weight. Sometimes it is called “relative molecular mass” since the mass of a carbon element is designated to be 12 and other molecules or elements are given masses relative to that.
The molar mass of a small molecule such as an amino acid (eg glycine is NH2CH2COOH and has molecular mass = 75.07 g.mol-1) is much less than the molar mass of a protein (eg haemoglobin has molecular mass ~ 64500 g.mol-1).
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Predict Considering the patterns you have identified, estimate the likely melting
points of cadmium (Cd), vanadium (V), and cobalt (Co). Enter your estimates in
the figure.
Give a handwritten explanation and response. Estimate the expected melting temperature of cadmium (Cd), vanadium, and other elements based on the patterns you have found.
What does melting point mean?
The temperature at which a pure substance's solid and liquid states can coexist in equilibrium is known as the melting point. A solid's temperature will rise when heat is added to it until its melting point is reached.
How do melting and boiling points differ?
The melting point
The temperature that a quality of output into a liquid under normal air pressure is known as the melting point. The temperature at which a liquid's vapor pressure equals the pressure around it, turning the liquid into vapor (and vice versa).
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The atomic mass of the element niobium (Nb) is 92.906 amu. Which measurement is correct?(1 point)
Responses
1 mole of Nb = 92.906 grams
1 mole of Nb = 92.906 grams
1 gram of Nb = 92.906 moles
1 gram of Nb = 92.906 moles
1 gram of Nb = 92.906 atoms
1 gram of Nb = 92.906 atoms
1 mole of Nb = 92.906 atoms
Niobium has an atomic mass of 92.90638 u. An atomic mass unit serves as the unit of measurement for mass (amu). A mass unit of an atom is 1.66 x 10-24 grammes.
What does the term "atomic" refer to?
Atomic is derived from the Greek word atomos, which means "uncut" or "indivisible," and means "indivisible particle" in Latin. atomic is defined as an adjective that refers to, contains, or is related to atoms.
What does atomic energy entail?
Nuclear energy, also known as atomic energy, is the considerable quantity of energy released in operations that have an impact on atomic nuclei, or dense centres of atoms. It differs from other atomic phenomena' energy, which solely involves an atom's orbital electrons in regular chemical reactions, for example.
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Answer:
1 mole of Nb = 92.906 grams
A person uses 720 kcal on a long hike. Calculate the energy used for the hike in each of the following energy units. A.) joules B.) kilojoules
A person uses 720 kcal on a long bike. A. The energy in joules is equal to 3221680 Joules. B. The energy in kilojoules is 3221.689 KJ.
What is energy ?
The term energy is defined as the capacity for doing work. It is exist in different types like potential, kinetic, thermal, electrical, chemical, nuclear, or other forms.
Given the energy used for the bike is 770 kcal.
We know that
1 cal = 4.184 J
The energy in Joules = 770 × 1000 × 4.184
= 3221680 J
The energy in kilojoules = 3221689 / 1000
= 3221.689 KJ
Thus, A. The energy in joules is equal to 3221680 Joules. B. The energy in kilojoules is 3221.689 KJ.
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What is the number of ammonia molecules made when 6 grams of hydrogen gas reacts with excess nitrogen? 3 H2+ N2 <-----> 2 NH3 a. 24 x 10^23 b. 6 x 10^23 c. 12 x 10^23 d. 18 x 10^23
The number of ammonia molecules made when 6 grams of hydrogen gas reacts with excess nitrogen is 12 × 10²³ molecules.
The reaction is given as :
3H₂ + N₂ ⇄ 2NH₃
Mass of the hydrogen = 6 g
moles of the hydrogen = mass / molar mass
= 6 / 2
= 3 mol
3 moles of the H₂ produces 2 moles of the NH₃
moles of the NH₃ = (2 / 3) × 3
= 2 mol
1 mol = 6.022 × 10²³ molecules
molecules of the ammonia, NH₃ = 2 × 6.022 × 10²³ molecules
= 12 × 10²³ molecules
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Cyanides inhibit lactose permease by A. Competing with lactose for the binding site on permease B. Abolishing the lactose gradient between the inside and outside of the cell C. Abolishing the proton gradient between the inside and outside of the cell D. Blocking conformational changes of the transporter B A
Cyanides inhibit lactose permease by abolishing the proton gradient between the inside and outside of the cell
By interfering with the proton gradient across the cell membrane, cyanides prevent the lactose permease protein from transporting lactose across the membrane. Protons (H+) are pumped out of the cell by the proton-motive force, which results in a difference in proton concentration between the inside and outside of the cell and creates the proton gradient.
This proton gradient is used by lactose permease to propel lactose transport into the cell. The enzyme cytochrome oxidase, which is found in the mitochondria and is in charge of the last stage of the electron transport chain, binds to the iron atom in the active site. This binding prevents the enzyme from working, which inhibits proton pumping and causes the proton gradient to fall, both of which hinder lactose permease from working.
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Calculate the approximate molecular weight of a protein composed of 701 amino acid residues in a single polypeptide chain. kDa approximate weight:
One single amino acid weighs 110 D a. Now, this problem is fairly simple. The way we find out, the weight of 701 amino acids is just multiplying. Ah, that number by 110. So all we have to dio is multiply 682 by 110. So our final answer will be 77,110.
What is amino acid?Amino acids are the building blocks of protein. Proteins are long chains of amino acids. Your body has thousands of different proteins that each have important jobs. Each protein has its own sequence of amino acids. The sequence makes the protein take different shapes and have different functions in your body.You can think of amino acids like the letters of the alphabet. When you combine letters in various ways, you make different words. The same goes for amino acids — when you combine them in various ways, you make different proteins.Amino acids are molecules used by all living things to make proteins. Your body needs 20 different amino acids to function correctly. Nine of these amino acids are called essential amino acids. Essential amino acids must be consumed through the food you eat. Essential amino acids can be found in a variety of foods, including beef, eggs and dairy.To learn more about molecules refer to:
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A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute.
A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute. The expression to determine the number of gallons left in the tank after m minutes is 35- m/4.
Considering that a 35-gallon water tank leaks at a rate of a quarter per minute.
Let "m" stand for the duration in minutes.
Gallons remaining in the tank equal the sum of the water that was originally inside and the water that has leaked.
35 gallons of water are still available after subtracting the amount of minutes spent at the rate of leakage.
Water remaining in gallons = 35 gallons - m minutes x 1/4
Water remaining in gallons = 35 - m/4
Your question is incomplete but most probably your full question was
A tank containing 35 gallons of water is leaking at a rate of 1/4 gallon per minute. Write an expression to determine the number of gallons left in the tank after m minutes.
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A gas at 600 torr and 300 K is heated to a final volume of 1000 torr. What is the final temperature of the gas?
Answer:
500K
Explanation:
We use Charle's law that states that at a constant pressure the volume of a given mass of a gas varies linearly with absolute temperature of the gas.
V ∝ T
V = kT
∴ k is the proportionality constant
v/T = as it a ratio between volume and temperature the value of k would be a constant quantity.
Therefore it can be written as:
v1 / T1 = V2 / T2
Now solving the question:
V1 = 600 torr
T1 = 300 K
V2 = 1000 torr
T2 = ?
600/300 = 1000/T2
T2= (1000 x 300)/600
T2= 500 K
The empirical formula of a chemical substance is c2h3. the molar mass of a molecule of the substance is 54.091 g/mol. what is the molecular formula of the chemical substance? a. c2h4 b. c4h8 c. c4h6 d. c6h9
The molecular formula of the chemical substance is C2H3 * 2.068 = C4H6 which is option (c)
The empirical formula of a chemical substance gives the lowest whole-number ratio of atoms in a molecule. The molar mass of a substance is the mass of one mole of the substance. To find the molecular formula of a substance, we need to determine the ratio of atoms in the molecule and compare it to the ratio given by the empirical formula.
The molar mass of the substance is 54.091 g/mol, and the empirical formula is C2H3. To find the molecular formula, we can divide the molar mass by the molar mass of the empirical formula.
54.091 g/mol / (2 x 12.011 g/mol + 3 x 1.008 g/mol) = 54.091 g/mol / 26.042 g/mol = 2.068
Since the ratio of atoms in the molecule is 2.068 times that of the empirical formula, the molecular formula is C2H3 * 2.068 = C4H6 which is option (c)
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Answer:
C4H6 (c)
Explanation:
I took the test
a 0.32 m aqueous solution of an unknown solute has a density of 1.08 g/ml. the molar mass of the solute is 146.8 g/mol. what is the molality of this solution? report your answer in mol/kg and round to the second decimal place.
Answer: 0.31
Explanation:
molarity = 0.32 mol of solute / 1 L solution
find kg of solute: 0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg
find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution
find kg of solvent: 1.08 kg solution - 0.046976 kg solute = 1.033 kg water
molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kg
According to molar concentration , the molality of the solution upto second decimal place is 0.31 m.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion.
molarity = 0.32 mol of solute / 1 L solution.To find kg of solute-0.32 mol of solute x 146.8 g/mol = 46.976 g = 0.046976 kg. To find kg of solution: 1 L solution x (1000 mL / 1 L) x (1.08 g/mL) (1 kg / 1000 g) = 1.08 kg solution. To find kg of solvent: 1.08 kg solution - 0.046976 kg solute = 1.033 kg water.
Thus, molality = 0.32 mol solute / 1.033 kg water = 0.31 mol/kg.
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Type the correct answer in each box. what is the empirical formula? a compound being used in experimental medicine is 78.14% boron (b) and 21.86% hydrogen (h). the empirical formula of the compound will have a boron to hydrogen ratio of : .______
In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound.
What is the empirical formula? In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2. Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.The molecular formula, on the other hand, shows the number of each type of atom in a molecule.The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas.The empirical formula is BH₃. Its B:H ratio is 1:3.
Assume that you have 100 g of the compound.
Then you have 78.14 g B and 21.86 g H.
Now, we must convert these masses to moles and find their ratios.
From here on, I like to summarize the calculations in a table.
Element Mass/g Moles Ratio Integers
B 78.14 7.2285 1 1
H 21.86 21.686 3.0001 3
The empirical formula is BH₃.
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The empirical formula will have a boron to hydrogen ratio of 1:3.
What is the empirical formula?In chemistry, the empirical formula of a chemical compound is the simplest whole number ratio of atoms present in a compound. A simple example of this concept is that the empirical formula of sulfur monoxide, or SO, would simply be SO, as is the empirical formula of disulfur dioxide, S2O2.
Thus, sulfur monoxide and disulfur dioxide, both compounds of sulfur and oxygen, have the same empirical formula. However, their molecular formulas, which express the number of atoms in each molecule of a chemical compound, are not the same.
The molecular formula, on the other hand, shows the number of each type of atom in a molecule. The structural formula shows the arrangement of the molecule. It is also possible for different types of compounds to have equal empirical formulas.
Determination of boron to hydrogen ratio in empirical formula:The empirical formula is BH₃. Its B:H ratio is 1:3.
Assume that you have 100 g of the compound.
Then you have 78.14 g B and 21.86 g H.
Now, we must convert these masses to moles and find their ratios.
From here on, I like to summarize the calculations in a table.
Element Mass/g Moles Ratio Integers
B 78.14 7.2285 1 1
H 21.86 21.686 3.0001 3
The empirical formula is [tex]BH_{3}[/tex].
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PLS HELP ME ASAP I NEED HELP PLS PLS PLS PLS PLS PLS PLS PLS PLS PLS
The balanced chemical reaction of sodium and sulfur can best be described as: B. 2Na(s) + S(s) → Na₂S(s)
How can the reaction be represented?To represent the reaction between sodium and sulfur, we would express the elements and their states as shown above. So, 2 atoms of sodium would react with 1 atom of sulphur to yield a compund known as sodium sulphide.
This compound contains two atoms of sodium and 1 atom of sulphur. The physical state is solid. So, the correct option number that expresses this is B.
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Draw the lewis structure for resonance forms of acetamide (CH3CONH2)
The Lewis structure for acetamide is drawn by connecting the atoms with single bonds and assigning lone pairs of electrons to the non-bonding atoms.
The central carbon atom has four bonds and no lone pairs, while the oxygen atom has two bonds and two lone pairs. The two nitrogen atoms each have three bonds and one lone pair. The hydrogen atoms only have one bond each, as they only have one electron in their outer shell.
For the resonance forms of acetamide, the Lewis structure is drawn by connecting the atoms using double bonds instead of single bonds, while keeping the same number of lone pairs.
This forms a resonance hybrid between the two forms, where the electrons are delocalized. The central carbon atom has two double bonds and no lone pairs, while the oxygen atom has one double bond and two lone pairs. The two nitrogen atoms each have two double bonds and one lone pair. The hydrogen atoms also only have one bond each.
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If 25.0 ml of a 2.0 m naoh solution is used for the reaction
To solve this problem is not necessary to have the chemical reaction. Just use the formula of Molarity and solve it for moles.
moles = 0.2 x 0.025=0.005.
Define mole?In the International System of Units, a substance's amount is measured in moles, which are denoted by the sign mol. The quantity of a substance is a measurement of the number of elementary entities of a specific substance present in an object or sample. Exact 6.022140761023 elementary items are required to define a mole.The unit of measurement known as the mole (symbol: mol) refers to the quantity of matter in a system that includes the same number of atoms as there are in 0.012 kilograms of carbon 12.Previously, a mole was defined as the quantity of atoms found in 12 grams of carbon-12, as determined through experimentation.The complete question is:
NaOH (aq) + HCl(aq) H2O + NaCl (aq)
If 25.0 mL of a 0.2 M NaOH solution is used for the reaction
shown above, how many moles of NaOH were involved in the
reaction? _moles.
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The number of moles for the chemical reaction will be equal to 0.005, if 25.0 ml of a 2.0 m NaOH solution are used.
What is mole?The amount of a material is expressed in moles, which are represented by the symbol mol in the International System of Units. A substance's amount is a measurement of how many of its fundamental components are present in an object or sample. To define a mole, precisely 6.022140761023, elementary components are needed.
The term "mole" (symbol: mol) refers to the amount of matter in a system that contains the same number of atoms as there are in 0.012 kilograms of carbon 12. Previously, a mole was determined through experimentation to be the number of atoms present in 12 grammes of carbon-12.
Determine the number of moles:moles = 0.2 x 0.025=0.005.
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The complete question is:
NaOH (aq) + HCl(aq) H2O + NaCl (aq)
If 25.0 mL of a 0.2 M NaOH solution is used for the reaction
shown above, how many moles of NaOH were involved in the
reaction? _moles.
Calculate the number of moles in 2.4x10^46 molecules of Na ions
explain how you got your answer pls.
There would be 4 * 10^22 moles of the sodium ions.
What is the number of moles?We have to know that the number of moles of the ions can be obtained by the use of the formula for the Avogadro's number. From the Avogadro's number, we know that one mole of the substance is going to contain about 6.02 * 10^23 molecules of the sodium ions.
As such we have that;
If 1 mole can contain about 6.02 * 10^23 molecules of the sodium ions
x moles would contain 2.4x10^46 molecules of Na ions
x = 1 * 2.4x10^46/ 6.02 * 10^23
x = 4 * 10^22 moles
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