Answer:
192mmHg
Explanation:
The partial pressure of O2 in the gas mixture is 192 mmHg. The correct option is a.
What is Partial Pressure?
Partial pressure refers to the pressure exerted by a single gas in a mixture of gases. In a mixture, each gas exerts a partial pressure proportional to its concentration or mole fraction and is independent of the presence of other gases.
Dalton's law of partial pressures states that the total pressure of a gas mixture is equal to the sum of the partial pressures of its individual components.
The total pressure of a gas mixture is the sum of the partial pressures of the individual gases. In this case, the total pressure is given as 755 mmHg, and the partial pressures of Ar and He are given as 174 mmHg and 389 mmHg, respectively.
To find the partial pressure of O2, we subtract the sum of the partial pressures of Ar and He from the total pressure:
Partial pressure of O2 = Total pressure - Partial pressure of Ar - Partial pressure of He
= 755 mmHg - 174 mmHg - 389 mmHg
= 192 mmHg
Therefore, the partial pressure of O2 in the gas mixture is 192 mmHg, which corresponds to option (a).
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Complete question:
The total pressure of an O2-Ar-He gas mixture is 755 mmHg. If the partial
pressure of Ar is 174 mmHg and the partial pressure of He is 389 mmHg,
then the partial pressure of O2 is —
a 192 mmHg
b 282 mmHg
c 366 mmHg
d 563 mmHg
Draw the structure of 5-tert-butyl-2-methyl-3-octyne.
The structure is attached with the answer. 5-tert-butyl-2-methyl-3-octyne is a hydrocarbon molecule with a chain of 14 carbon atoms, so it is an alkyne.
At the beginning of the chain is a triple bond, which is the characteristic feature of an alkyne. The chain also contains two methyl and one tert-butyl group. The methyl group is attached to the second carbon atom in the chain, while the tert-butyl group is attached to the fifth carbon atom in the chain.
This molecule has a total of 20 hydrogen atoms, with three hydrogen atoms attached to each of the carbon atoms in the chain. 5-tert-butyl-2-methyl-3-octyne is a relatively reactive molecule because of its triple bond. This molecule can undergo a variety of reactions, including addition reactions, oxidation reactions, and substitution reactions. The reactivity of this molecule makes it a useful chemical in a variety of industrial and laboratory applications.
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When scientists analyze the rock record, they look for fossils evidence. how are scientist able to determine that the majority of all organisms are now exitinct?
An organism is considered extinct if the fossil evidence reveals the remains of one that is no longer present-day. As a result, scientists might conclude that the majority of Earth's animals are already extinct because they have noted that certain qualities and traits are absent from species that are still alive.
What is extinction?The phrase "extinction" refers to the end of a particular type of organism or a set of types, typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last individual of the species is widely considered to be the moment of extinction.
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Please help, will give brainiest
QUESTION 1.
Element X on Planet Qatar has three known isotopes: X-121 with a relative abundance of 43.2%, X-123 with a relative abundance of 53.1%, and X-129 with a relative abundance of 3.70%. What is the average atomic mass in amu of Element X given this information?
QUESTION 2.
How did Rutherford's experiment change the way scientists had previously viewed atomic structure? How did this pave the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model?
QUESTION 3.
How is percent abundance related to average atomic mass?
Answer 1
The average atomic mass in a.m.u of Element X given this information is 122.358.
Answer 2
Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure.
Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his model of the atom, the structure of the nucleus became more well-defined following the discovery of protons (1919) and neutrons (1932) as the particle constituents of the nucleus.
Answer 3
The percent abundance is related to the number fraction as fi = Pi/100 and used as in the formula written above in order to find average mass
What is atomic structure?Atomic structure refers to the structure of an atom comprising a nucleus (centre) in which the protons (positively charged) and neutrons (neutral) are present.
The average atomic mass in a.m.u of Element X given this information is ((121 * 43.2) + (123 * 53.1) + (129 * 3.70)) / 100
=5227.2 + 6531.3 + 477.3
=12235.8 / 100
122.358
Rutherford's experiment change the way scientists had previously viewed atomic structure as it provided insight into atomic structure, and Rutherford's model of the atom was proposed as a small, positive, massive nucleus contains the very vast majority of the mass of the entire atom with negatively charged electrons surrounding it at relatively large distances.
Rutherford's experiment paved the way for subsequent changes up to and including the currently accepted quantum mechanical atomic model as his model of the atom, the structure of the nucleus became more well-defined following the discovery of protons in 1919 and neutrons in 1932 as the particle constituents of the nucleus.
It was during the 1920s that a "wave mechanical model" came along through the work of several physicists most importantly de Broglie, Heisenberg, and Schrodinger) and Bohr's concept of electrons "orbiting" the nucleus was abandoned in favor of "orbitals" which are more abstract probabilistic representations of electronic structure within an atom.
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C4H8 +O₂ → _____ CO₂ + ______ H₂O
Answer:
look at the attachment I wrote it out for you.
How many molecules of carbon dioxide are released during one turn of the citric acid cycle?
a. 2
b. 3
c. 4
d. 6
The answer is Two molecules of carbon dioxide are released during one turn of the citric acid cycle.
Two carbons - from acetyl CoA-enter the citric acid cycle in each turn, and two carbon dioxide molecules are released. However, the carbon dioxide molecules don't actually contain carbon atoms from the acetyl CoA that just entered the cycle.
Instead, the carbons from acetyl CoA are initially incorporated into the intermediates of the cycle and are released as carbon dioxide only during later turns. After enough turns, all the carbon atoms from the acetyl group of acetyl CoA will be released as carbon dioxide.
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Causes of carbon monoxide poisoning
Car as well as truck engines emit fumes (smoke) that contain carbon monoxide. tinier gasoline engines Fu el burning space warmers (not electric).
The inhalation of combustion gases might result in carbon monoxide pois oning. Your body substitutes carbon monoxide for the oxygen in human red blood cells whenever you have too enough carbon monoxide in the air you are breathing. Due to this, oxygen cannot reach your bo dy's tiss ues as well as org ans.
The majority of CO- poiso ning deaths are due to fires, although about one-third are also brought on by stoves, portable heaters, as well as car exhaust. These are frequently linked to exhaust system problems or obstructions, as well as suic ide attempts.
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Share your thoughts on the genetic modification of crops and food for the purpose of disease treatment in humans. Example: genetically inserting medicine into food to prevent diseases, the way current vaccines work.
Genetic modification of crops and food have both advantages and disadvantages. These techniques create desired characteristics in crops but latter that might affect our health as well.
What is genetic modification ?Plants and animals can be genetically modified to create desired characteristics in them. Gene techniques such as CRISPER are nowadays becoming popular in agricultural field.
Features such as rapid growth, extra production, coloring, change in size, antibacterial properties, climate survival etc. can be imparted to plants by genetic engineering.
However, genetically modified crops make some health issues some times. It has been reported that, some genetically modified vegetables causes sever health impacts.
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is it true that Kelp and plants can break down starch into sugar and use it to grow and release in the process only when it is dark?
Answer:
Yes it's true ooooooooo
Use this graphic to explain how matter is conserved in a nuclear reaction
Nuclear processes alter the sorts of atoms present, but chemical reactions do not. The electrons in the atom play a significant role in chemical reactions when nucleus reactions occur in atom nuclei.
What is nuclear explain?The energy found in an atom's nucleus, or core, is known as nuclear energy. Energy maintains the nucleus of atoms together, the minuscule units that make up all matter in the universe. The dense nucleus of an atom has an enormous quantity of energy.
Why is a nuclear threat a threat?The most lethal weapons on earth are nuclear weapons. One can wipe out an entire metropolis, perhaps killing millions of people, endangering the ecosystem and the lives of future generations due to its long-term devastating impacts.
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If a reaction appears to result in a change of mass, it is usually because a reactant or product that is a __________ has not been taken into account. What word completes the sentence?
Answer:Gas is the answer
How does a sea breeze affect the weather?
A.
It decreases land temperatures near the ocean.
B.
It increases land temperatures near the ocean.
C.
It decreases rain formation over land near the ocean.
D.
It increases the cloud coverage over the land near the ocean.
Pls help!!
Answer:
it decreases land temperature near the ocean
the elements and compounds present after a chemical reaction are called the ___________.
The elements and compounds present after a chemical reaction are called the products.
Which of these is an
example of a chemical
property?
A. Potassium.ignites when placed in water.
B. Sodium metal is soft and malleable.
C. Aluminum is a shiny, silver color.
D. Iron melts at 1,535 °C.
Answer:
B
Explanation:
I know but I can't answer well. We might to choose the best answer so the answer is possible to be B.
Explain the trend for the last successive ionization energies for 2nd period of elements (Li, Be, B, C, N, O, F, Ne).
In general, ionization energy increases across a period and decreases down a group. Across a period, effective nuclear charge increases as electron shielding remains constant.
Define ionization energies?The ionization energy is a metric indicating an element's capacity to engage in chemical processes that call for the donation of electrons or the production of ions. It is also often correlated with the type of chemical bonding that occurs when elements combine to form compounds. Additionally see electron affinity and binding energy.The least amount of energy needed to free the most loosely bound electron from an isolated gaseous atom, positive ion, or molecule is known as the ionization energy in physics and chemistry.The amount of energy required for an isolated, gaseous atom to discharge an electron, creating a cation, is known as the ionization energy.To learn more about ionization energies refer to:
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0. 399 g of an unknown gas at stp fills a 550. Ml flask. What is the molar mass of the gas?.
The molar mass of the gas would be 16.36 g/mole.
The formula for molar mass: M = (m.RT)/ (P.V)
P stands for the pressure of the ideal gas
V stands for the volume of the ideal gas
R stands for the universal gas constant
T stands for the temperature.
In this case, we are given that:
P = 1 atm (standard conditions)
T = 273K (standard conditions)
R = 0.082 lit. atm. K⁻¹.mol⁻¹
Mass of gas (m) = 0.399 g
Volume of gas (V) = 550 mL = 0.55 L
Therefore, the molar mass of the gas would be:
M = (m.RT)/ (P.V)
M = (0.399 x 0.08206 x 273) / (1 x 0.55)
M = 16.36 g/mole
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Draw the structure of the cycloalkane 1, 4-dimethylcyclohexane. Draw the molecule on the canvas by choosing buttons from the Tools (for bonds), Atoms, and Advanced Template toolbars. The single bond is active by default. Include all hydrogen atoms
The parent component in the structure of 1,4- dimethyl cyclohexane is cyclohexane, which has two methyl groups attached at the first and fourth positions of the carbon ring.
Cyclohexane is a saturated hydrocarbon with the molecular formula CₙH₂ₙ where n represents the number of carbon atoms present in the organic compound. They are represented as simple polygons with the sides representing carbon-carbon bonds. Each carbon atom is held together by two hydrogen atoms. A molecule's multiple rings may share one or more common atoms. One carbon atom is shared by two rings in spirocyclic compounds. These compounds are uncommon.
According to the IUPAC system, cycloalkanes are named with the prefix cyclo-.
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How is Hess's law applied in calculating enthalpy?
A. The first and last reactions in a path are added together.
B. Similar equations are substituted for unknown reactions.
OC. All the reactions in a path are added together.
D. The final equation in a path from reactants to products is used.
SUBMIT
according to the question, All the reactions in a path are added together.
What is the reactions?
Reactions are the processes in which one or more substances are changed into one or more new substances. They are caused by a chemical change in which the atoms of the reactants rearrange to form the atoms of the products. Reactions can be classified according to the type of energy released or absorbed during the reaction, such as exothermic and endothermic. Reactions can also be classified according to the type of reactants involved, such as single-replacement and double-replacement reactions. Reactions can occur quickly and release a large amount of energy, or they can occur slowly and release little or no energy. Reactions can also occur in a series of steps, such as in a reaction mechanism. In general, reactions require reactants, a catalyst, and an energy source in order to occur.
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Zn will replace the metal in the ionic compound LiF : true or false
Zn will replace the metal in the ionic compound LiF . false
What is metal ?
Metal is a hard material composed of a variety of elements, such as iron, aluminum, nickel, zinc, copper, lead, tin, and others. Metals are malleable, ductile, and generally have high electrical and thermal conductivity.
Metals can be polished to a shine and are often used in a variety of applications such as jewelry, construction, manufacturing, and many more. Metals are also used in many industries including automotive, aerospace, and medical. Metal is a durable and versatile material that is used for a variety of applications, from industrial to decorative.
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How can you compare the rates of effusion of two gases in a mixture?
You can compare the rates of effusion of two gases in a mixture by their molecular weights.
The square root of a gas's molecular weight has an inverse relationship with the rate of effusion of that gas. Therefore, you may compute the square roots of two gases' molecular weights and then invert that ratio to compare the rates of effusion of the two gases in a mixture.
The rate of effusion will be slower for the gas with the greater molecular weight and faster for the gas with the lower molecular weight.
For instance, the ratio of two gases' rates of effusion is given by R = (M1 / M2)-1 if their molecular weights are M1 and M2, respectively.
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If you were to heat up a 1-kilogram rock and 1 kilogram of water you would see that the rock both gains heat and loses heat faster than the water. If you allow them to cool down which one will come back to room temperature faster?
You would observe that the rock absorbs heat more quickly than the water and releases it more slowly. The rock will reach room temperature more quickly if you let them cool.
How come land loses heat more quickly than water?The majority of solar radiation that hits water's surface is reflected back into the atmosphere. Given that land absorbs more solar radiation, both the land's surface and the vegetation it supports retain more heat.
Soil or water will release heat more slowly.Water absorbs and releases heat more slowly than land because its specific heat is higher than that of dry soil. Due to the high heat capacity of water, large bodies of water often tend to moderate the temperature of neighboring land.
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Do you think odor is a property? Explain your ideas.
Answer:
yes, odor is classified as a physical property
Explanation:
Calculate the ratio of H* ions to OH-ions at a pH = 7.
Find the concentration of H* ions to OH ions listed in
Table B of your Student Guide. Then divide the H*
concentration by the OH concentration. Record this
calculated ratio in Table A of your Student Guide.
Compare your approximated and calculated ratios of H+
ons to OH-ions at a pH = 7. Are they the same? Why or
why not? Record your comparison in Table A.
What is the concentration of H+ ions at a pH = 7?
mol/L
What is the concentration of OH-ions at a pH = 7?
mol/L
What is the ratio of H+ ions to OH-ions at a pH = 7?
:
Please help!! Worth 100 points!!
a) The concentration of the hydrogen ions is 1 * 10^-7 M
b) The concentration of the hydroxide ions is 1 * 10^-7 M
c) Ratio of the hydrogen to the hydroxide ion is 1:1
What is the pH?We know that the pH of the solution would have to do with ratio of the hydrogen ion and the hydroxide ions that we have in the solution. We know that the pH values that range from 0 -6 is acid, 7 is neutral and 8 - 14 is basic.
Then we have that;
Concentration of the hydrogen ion in the solution is obtain from the formula;
[H^+] = Antilog (-pH)
At pH 7 we have;
[H^+] = Antilog (-7)
= 1 * 10^-7 M
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Correctly classify each of the following compounds as highly soluble or as either slightly soluble or insoluble in water.
ionic and polar compounds are highly soluble in water whereas the covalent and organic compounds are highly insoluble in water
What is the difference between soluble and insoluble?Soluble fiber dissolves in water, and includes plant pectin and gums. Insoluble fiber doesn't dissolve in water. It includes plant cellulose and hemicellulose. Most plants contain both soluble and insoluble fiber, but in different amounts.Soluble fiber is found in foods such as oat bran, barley, nuts, seeds, beans, lentils, peas, and some fruits and vegetables. Insoluble fiber appears to speed the passage of foods through the stomach and intestines and adds bulk to the stool. It is found in foods such as wheat bran, vegetables and whole grains.Soluble means capable of dissolving in a solvent whereas insoluble means incapable of dissolving in a solvent.To learn more about soluble and insoluble refers to:
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How might the atoms {metals differ from on another?
Atoms of different metals can differ in number of protons, electron configuration, atomic radius, melting/boiling point, hardness/ductility, and conductivity.
what is difference between atom metals with one another?
Atoms of different metals can differ from each other in a number of ways, including:
Number of protons: The number of protons in the nucleus of an atom determines its atomic number and thus its identity as an element. Different metals will have different atomic numbers and therefore different numbers of protons.Electron configuration: The arrangement of electrons in the outermost shell of an atom, also known as the valence electrons, determine the chemical properties of an element. The electron configuration of different metals will be different.Atomic radius: The size of an atom is determined by its atomic radius. Different metals will have different atomic radii.Melting and boiling point: The melting and boiling points of different metals will vary depending on the strength of the metallic bond holding the atoms together. Generally, metals with stronger metallic bonds will have higher melting and boiling points.Hardness and ductility: The hardness and ductility of a metal depend on the crystal structure and the strength of metallic bonds. Harder metals are less ductile and more brittle, while softer metals are more ductile and less brittle.Conductivity: The ability of a metal to conduct electricity is related to the number of free electrons in the outermost shell of its atoms, the metallic bond strength, and the atomic radius. Different metals will have different conductivity.To learn more about atom refer:
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Laura has three beakers. Each contains 200 cm³ of a colourless liquid. Describe how Laura could find out which beakers contain pure water, and which contain solutions. Explain your answer.
Laura could use a few different methods to determine which beakers contain pure water and which contain solutions. One method is to test the boiling point of each liquid. Pure water boils at 100 degrees Celsius at standard pressure. If the liquid in a beaker boils at a temperature higher than 100 degrees Celsius, it is likely a solution and not pure water. Another method is to test the freezing point of each liquid. Pure water freezes at 0 degrees Celsius at standard pressure. If the liquid in a beaker freezes at a temperature other than 0 degrees Celsius, it is likely a solution and not pure water.
Another method is through density test. Pure water has a density of 1g/cm³ at 4°C. Laura can use a hydrometer, which is an instrument that measures the density of a liquid to check if the density of the liquids in the beakers is equal to 1g/cm³. If it is not, then it is not pure water.
Additionally, Laura could also test the conductivity of the liquids. Pure water is a poor conductor of electricity, whereas solutions can conduct electricity. Laura could use a conductivity meter to check the conductivity of the liquids. If a liquid conducts electricity, then it is likely a solution and not pure water.
Finally, Laura could also use a refractometer, which measures the refractive index of the liquid. The refractive index of pure water is 1.333 and any deviation from this value indicates the presence of dissolved solutes.
It's important to notice that no single test can confirm that a liquid is pure water, but a combination of tests can give us a strong indication of it.
A gaeou mixture of C2H4, CH4, CO and N2 at 400 K & 1 atm wa added with exce of O2 & ubjected to parking in a rigid container (volume contant). Preure of CO2 obtained at 400 K in ame volume i 0. 9 atm and that of H2O vapour i 0. 8 atm. If mole of C2H4 and CH4 are equal, then find the um of preure of C2H4 and N2 ga
The pressure of C2H4 and N2 gas is 0.3 atm
Based on the information provided, it appears that C2H4 and CH4 are added to a mixture of CO and N2 and then exposed to excess oxygen. The resulting mixture is then placed in a rigid container at a constant volume, and the pressure of CO2 and H2O vapor is measured to be 0.9 atm and 0.8 atm, respectively.
If the number of moles of C2H4 and CH4 is equal, the sum of the pressure of C2H4 and N2 gas can be calculated by subtracting the pressure of CO2 and H2O vapor from the total pressure. Since the total pressure is 1 atm, the sum of the pressure of C2H4 and N2 gas is:
1 atm - 0.9 atm - 0.8 atm = 0.3 atm
It is worth noting that this answer is based on the information provided and any additional information or assumptions may affect the final result.
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Please help Chemistry
5.0 mol Al reacts with 6.0 mol O2 to
form Al2O3.
4AI + 302 → 2Al2O3
How many moles of Al2O3 form
when all 5.0 moles of Al are used up?
[ ? ] mol Al2O3
Round your answer to the tenths place.
The amount of the aluminum oxide that is formed is 2.5 moles.
What is the number of moles formed?We must have it at the back of our minds that in the case of the questions that involves stoichiometry, the limiting reactant can be said to be the compound that is used up in the reaction.
We are told here that the substance that has been used up in this reaction is the aluminum then it means that this must be the limiting reactant here.
If 4 moles of aluminum produces 2 moles of aluminum oxide
5 moles of aluminum would produce 5 * 2/4
= 2.5 moles of aluminum oxide.
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How many grams of BE(NO2)2 are needed to make 550 mi of a 2.5 m solution?
The mass of Be(NO₂)₂ required to make 550 mL of a 2.5 M solution is 126.25 g.
What is the molar concentration of a solution?Molar concentration is a measurement of the concentration of a solute in a solution, in terms of the quantity of material per unit volume of solution. The number of moles per liter, represented by the unit sign mol/L or mol/dm³ in SI units, is the most common way to measure molarity in chemistry.
Mathematically;
Molar concentration = number of moles/volume in liters
The number of moles is also determined using the formula below:
Number of moles = mass/molar mass
Hence;
Molar concentration = mass / molar mass * volume in liters
Therefore:
mass = Molar concentration * molar mass * volume in liters
The molar mass of Be(NO₂)₂ = 101 g/mol
Mass of Be(NO₂)₂ required = 2.5 * 500 * 1/1000 * 101
Mass of Be(NO₂)₂ required = 126.25 g
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how many atoms of oxygen are in 1.50 moles of aluminum oxide?
How many moles of hcl are in a 100 cm3 of 0. 2 mol/dm3 hydrochloric acid solution?.
It contain 2 mol of HCl. To find the moles of HCl, you have to change the volume units into dm³ or liter.
How to calculate the value of that HCl mole?
As per data given:
Vacid = 100 cm³
Molacid = 0.2 mol/dm³ = 0.2 mol/L
First, we have to change volume unit into liter or dm³. So
Vacid = 100 cm³ = 0.1 L
Then calculate the moles of HCl:
Moles of HCl = Molacid : Vacid
Moles of HCl = 0.2 : 0.1
Moles of HCl = 0.2 x 10
Moles of HCl = 2 mol
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