Answer:
Explanation:
The rocks are composed of mineral grains combined in different ways and having various properties. Minerals are naturally occurring chemical compounds in which atoms are arranged in three-dimensional patterns.
A 9.725-g gaseous mixture contains ethane () and propane (). Complete combustion to form carbon dioxide and water requires 1.115 moles of oxygen gas. Calculate the mass percent of ethane in the original mixture.
Answer:
% = 33.83%
Explanation:
To do a better understanding of this, we can treat the mixture of the combustion as two separate reactions, in that way, we can have an idea of what is happening and how to calculate the mass percent.
So the combustion reactions in this mixture are:
2C₂H₆ + 7O₂ ---------> 4CO₂ + 6H₂O
C₃H₈ + 5O₂ ----------> 3CO₂ + 4H₂O
Now that we have both reactions (And balanced) we can hace an idea of the mole ratio between every compound in the mix.
For practical purposes, let's call "a" the mass of ethane, and "b" the mass of propane. The innitial mix have 9.725 g, so this means that:
a + b = 9.725 g (1)
Now that we have this, we can write a relation between the moles of oxygen and the moles of the gases. If we have 1.115 moles of oxygen, and also know the mole ratio of oxygen to "a" and "b", so:
moles O₂ = moles a (moles O₂/moles a) + moles b (moles O₂/moles b) (2)
And we know that moles a and moles b are:
moles a = a / MW
moles b = b / MW
The MW of a is 30 g/mol and the MW of b is 44 g/mol
Replacing the given data we have:
1.115 moles O₂ = (a/30)(7 moles O₂/2 moles a) + (b/44)(5 moles O₂/1 mole b)
1.115 moles O₂ = (0.1167a) moles O₂ + (0.1136b) moles O₂
To keep solving this, we can use expression (1) to solve for b, and then, replace here and have only one equation with 1 incognite:
a + b = 9.725 g
b = 9.725 - a (3)
Replacing above we have:
1.115 = 0.1167a + 0.1136(9.725 - a)
1.115 = 0.1167a + (1.1048 - 0.1136a)
1.115 - 1.1048 = 0.1167a - 0.1136a
0.0102 = 0.0031a
a = 3.29 g
Now, that we have the mass of the ethane, we can calculate the mass percent:
% = (3.29 / 9.725) * 100
% = 33.83%Hope this helps
For many purposes we can treat methane (CH4 as an ideal gas at temperatures above its boiling point of -161. °C Suppose the temperature of a sample of methane gas is raised from -19.0 °C to 12.0 °C, and at the same time the pressure is changed. If the initial pressure was 5.6 atm and the volume decreased by 50.0%, what is the final pressure? Round your answer to the correct number of significant digits.
Answer: The final pressure is 12.6 atm
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 5.6 atm
[tex]P_2[/tex] = final pressure of gas = ?
[tex]V_1[/tex] = initial volume of gas = v
[tex]V_2[/tex] = final volume of gas = [tex]v-\frac{50}{100}v=0.5v[/tex]
[tex]T_1[/tex] = initial temperature of gas = [tex]-19.0^0C=(-19+273)K=254K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]12.0^0C=(12.0+273)K=285K[/tex]
Now put all the given values in the above equation, we get:
[tex]\frac{5.6\times v}{254}=\frac{P_2\times 0.5v}{285}[/tex]
[tex]P_2=12.6atm[/tex]
The final pressure is 12.6 atm
How many atoms are in a 121.4 gram sample of Aluminum i(Al) ?
Answer:
27.08 x 10²³ atoms of Al .
Explanation:
121.4 grams of Aluminum = 121.4 / 26.98 moles of Aluminum
= 4.4996 moles
1 mole of Aluminum contains 6.02 x 10²³ atoms of Al
4.4996 moles of Aluminum contains 6.02 x 10²³ x 4.4996 atoms of Al
= 27.08 x 10²³ atoms .
how might the biodiversity of a mowed lawn compare to that of huge weedy field?
Answer: The mowed lawn is the one from where the grasses are removed by using the machines or tools.
Explanation:
The mowed lawn is expected to have low number of species as the grasses may be few or scanty thus can support the population of few species like insects, mice, birds, and small number of grazing animals. On the other hand the weedy field can be hub of insects, reptiles like snakes, small mammals, and large mammals. Large weed field can provide food, and habitat to the large number of species. This will support the increase in biodiversity as compared to the mowed lawn.
Calculate the amount of copper (in moles) in a 29.4 g pure copper sheet.
Answer:
Number of moles = 0.4626 (Approx)
Explanation:
Given:
Mass of copper = 29.4 gram
Find:
Number of moles
Computation:
Atomic mass of copper = 63.546
Number of moles = Mass / Atomic mass
Number of moles = 29.4 / 63.546
Number of moles = 0.4626 (Approx)
HELPPPPPPPPPPPPPPPPP ASAP!!!!!!!!!!!!!!!!!!
Answer:
i think that b is the awnser sorry if im wrong
Explanation:
Answer:
i think that b is the awnser sorry if im wrong
Explanation:
Based on this reaction, how many moles of H2 can be obtained starting with 3 mol CH4?
Answer:
9 moles of H₂ are produced
Explanation:
Note: The question is incomplete. the complete question and the given image is found below:
The diagram represents a high-temperature reaction between CH4 and H2O. Based on this reaction, how many moles of H2 can be obtained starting with 3 mol CH4?
From the attachment, the equation of the reaction can be written as:
2CH₄ + 2H₂O ----> 2CO + 6H₂
From the equation the reaction shown above, 2 moles of methane, CH₄ reacts with 2 moles of gaseous water or steam, H₂O (since the reaction occurs at a high temperature) to produce six moles of hydrogen gas, H₂.
Therefore, starting with 3 moles of CH₄ and assuming the number of H₂O are equal to or greater than three moles (since the mole ratio of CH₄ to H₂O is 1 : 1 according to the equation of the reaction), number of moles of H₂ that will be produced = 3 * 6/2 moles of H₂
number of moles of H₂ produced = 9 moles
Therefore, 9 moles of H₂ are produced
Considering the reaction stoichiometry, 9 moles of H₂ can be obtained starting with 3 moles of CH₄.
The balanced reaction is:
CH₄ + H₂O → CO + 3 H₂
Reaction stoichiometryBy reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
CH₄: 1 mole H₂O: 1 mole CO: 1 mole H₂: 3 molesAmount of moles of H₂ obtainedThen you can apply the following rule of three: if by stoichiometry 1 mole of CH₄ produce 3 mole of H₂, 3 moles of CH₄ will produce how many moles of H₂?
[tex]amount of moles of CH_{4} =\frac{3 moles of CH_{4}x3 moles of H_{2} }{1 mole of CH_{4}} [/tex]
amount of moles of H₂= 9 moles
Finally, 9 moles of H₂ can be obtained starting with 3 moles of CH₄.
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if you want to know the identity of an unknown substance, what type of formula would you most likely want to know?
Answer:
Smell: Most chemists can identify solvents by their distinctive smells (though this is a pretty bad idea). ¹
Melting point: If you've got very pure crystals, you can use their melting point to figure out which of several possible chemicals you've got.
Explanation:
I hope this helps and pls mark me brainliest :)
Answer:
the answer to the question is smell
How many grams of NaCl are in 4.25 mol of NaCl?
2.46 g NaCl
2.47 x 102 g Naci
5.64 g NaCl
546 g NaCl
Answer:
546 g NaCI
Explanation:
because 1 mole is equal to 1 moles NaCI or 58.44277 grams.
5. At high pressures, how does the volume of a real gas compare with the volume of an ideal gas under the same conditions, and why?
a. It is much greater because real gas partides take up space.
b. It is much less because real gas particles are not moving.
c. It is much less because at high pressures the temperature drops.
d. There is no difference because the gas laws are always obeyed.
Answer:
C. it is much less because at high pressure the temperature drops
At high pressures, the volume of a real gas is much less because at high pressures the temperature drops.
What is pressure?Pressure is defined as the force applied on an object perpendicular to it's surface per unit area over which it is distributed.Gauge pressure is a pressure which is related with the ambient pressure.
There are various units by which pressure is expressed most of which are derived units which are obtained from unit of force divided by unit of area . The SI unit of pressure is pascal .
It is a scalar quantity which is related to the vector area element with a normal force acting on it.It is distributed over solid boundaries and across arbitary sections of fluid normal to the boundaries at every point.Usually as the pressure increases ,volume increases.
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Show that, with appropriate coefficients, the two reactions can be summed to give the overall oxidation of SO2 by O2 to give SO3. Give the equation for the final overall oxidation of SO2 by O2 to give SO3 as your answer. Express your answer as a chemical equation. Identify all of the phases in your answer.
Answer:
See explanation
Explanation:
We know that the process of the oxidation of SO2 to SO3 is catalysed by NO2 gas. It occurs in two stages and i will show the balanced reaction equation of the both stages below;
Step 1
2NO2(g) + 2SO2(g) ------> 2NO(g) + 2SO3(g)
Step 2
2NO(g) + O2(g) -------> 2NO2(g)
So, the overall reaction equation is;
2SO2(g) + O2(g) ------> 2SO3(g)
Can someone help me with this
Answer:
a
b
d
c
Explanation:
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3. How can millions of
compounds be made from the
atoms of about 100 elements?
Answer:
The answer is that compounds are formed when elements are joined and held together by strong forces called chemical bonds. ... Covalent bonds share electrons between atoms in order to fill their electron shells. In the compound, molecules are held together by the attraction between the nucleus and the shared electrons.
Millions of compounds can be made from just 100 elements because the atoms of these 100 elements can combine with each other in different ways to produce countless compounds.
A compound is formed when atoms of two or more elements are chemically combined together.
100 elements can combine with each other in many different ways. For instance, carbon combines with almost all the known elements to form unique compounds in each case depending on the arrangement of atoms of elements or type of element in each of the compounds formed.
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Which of the following is not a chemistry topic?
A.the composition of ocean water
B.what ocean fish eat
C.the height of waves in surf
D.what a surf board is made of
Chemistry is the scientific field that studies matter and substances. It involves composition, structure, arrangement, etc. It does not involve the height of waves in the surf. Thus, option C is correct.
What is chemistry?Chemistry has been defined as the branch of study and science that studies, analyzes, investigates, and identifies matter and its components. It includes elements, molecules, and compounds.
The composition of ocean water involves the identification and analysis of the various substances. As ocean water is a matter and is studied in chemistry. The food the ocean fishes consume involves chemical composition.
The height of the waves in the surf is a measurement and is studied in mathematics and not chemistry. On the other hand, the composition of the surfboard involves the chemical and their bonds.
Therefore, option C . the height of the waves is not a topic of chemistry.
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Change of a liquid to a solid
Which one of the following statements best describes electronegativity in atoms?
A) Electronegativity is what happens when an atom gains an electron to become an anion.
B) Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond
C) Electronegativity is the energy lost when an atom gains an electron
D) Electronegativity is the energy absorbed when an atom loses an electron
Answer: B) Electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond
Explanation:
Electronegativity is defined as the property of an element to attract a shared pair of electron towards itself.
When the size of an atom decreases as we move across the period, as the electrons get added to the same shell and the nuclear charge keeps on increasing. Thus the electrons get more tightly held by the nucleus.
As, the size of an element decreases, the valence electrons come near to the nucleus. So, the attraction between the nucleus and the shared pair of electrons increases and thus the electronegativity increases.
ANSWER ASAP
The (blank) state is the lowest possible energy level that an electron can occupy.
When the electron gains energy, it may move to a higher energy level. This is called the (blank) state.
Answer:
The first one is ground and the second one is excited
Explanation:
i need help...............
Answer:
bird or bacteria and fungi
Explanation:
oof oof oof oof oof
A steel cylinder has a pressure of 550 torr at 177 degrees Celsius. What will be the pressure if the temperature is decreased by 87 degrees Celsius?
Answer:
[tex]P_2=507.7torr[/tex]
Explanation:
Hello there!
In this case, when we have a gas that is undergoing a change in both pressure and temperature, we utilize the Gay-Lussac's equation as shown below:
[tex]\frac{T_2}{P_2}=\frac{T_1}{P_1}[/tex]
Thus, since we are given the initial pressure and temperature and the final temperature, we can compute the final pressure as shown below:
[tex]P_2=\frac{P_1}{T_1}*T_2[/tex]
So we plug in, by making sure the temperatures are in kelvins, to obtain:
[tex]P_2=\frac{550torr}{(117+273)K}*(87+273)K\\\\P_2=507.7torr[/tex]
Best regards!
Which statement accurately describes the atoms of an atom of Sulfur 10 points with a mass number of 33? A) There are 16 particles inside of the nucleus and 17 particles outside of the nucleus B) There are 33 particles inside of the nucleus and 33 particles outside of the nucleus. C) There are 17 particles inside of the nucleus and 17 particles outside of the nucleus. D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Answer:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Explanation:
Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.
This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17
Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.
Protons and neutrons are in the nucleus and electrons are outside the nucleus.
Taking all the above into account, the correct answer is:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Answer:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
Explanation:
Sulfur has an atomic number of 16. The atomic number represents the number of protons, so sulfur has 16 protons.
This atom of sulfur has a mass number of 33. The mass number is the sum of protons and neutrons. Then, the number of neutrons is 33 - 16 = 17
Sulfur is a neutral atom. Therefore, it has the same number of positive charges (protons) and negative charges (electrons). Thus, sulfur has 16 electrons.
Protons and neutrons are in the nucleus and electrons are outside the nucleus.
Taking all the above into account, the correct answer is:
D) There are 33 particles inside of the nucleus and 16 particles outside of the nucleus.
g The gas molecules in the internal combustion engine chamber are in a high state of random motion. When the molecules are expelled through an exhaust pipe in a more ordered state, what will their temperature be as their temperature in the chamber before being exhausted
Answer:
Explanation:
Entropy is the measure of randomness of a system . When heat is added to a gas , gas molecules become more random and therefore , their entropy increases . Hence at higher temperature , entropy increases and randomness increases due to addition of heat .
Hence when a gas molecules become more ordered that means entropy decreases . Hence heat is withdrawn from the system . Hence temperature of the system is decreases .
In the given case , gas molecules are made more ordered that means their temperature is decreased to lower the entropy before they are exhausted .
Sam records the mass of his evaporating dish as 6.488 g. He records the mass of the evaporating dish and the sample of hydrate as 19.72 g. After heating the sample in the evaporating dish to constant weight, the mass of them combined is 11.344 g. How many moles of water were removed from the sample by the heating process?
Answer:
[tex]0.46[/tex] moles of water were removed from the sample by the heating process
Explanation:
Given
Mass of the evaporating dish [tex]= 6.488[/tex] grams
Mass of the sample of hydrate [tex]= 19.72[/tex] grams
Mass of the sample and dish after heating [tex]= 11.344[/tex] grams
The weight of water removed through evaporation
[tex]= 19.72 - 11.344 = 8.376[/tex] grams
Weight of one mole of water [tex]= 18[/tex] grams
Number of moles of water in [tex]8.376[/tex] Grams of water is equal to
[tex]\frac{8.376}{18} = 0.46[/tex] moles
A speed boat, at full throttle, can go 65.0 miles in 1.5 hours. What is the average speed of the boat?
The average speed = 43.33 miles per hours(mph)
Further explanationGiven
distance = 65 miles
time = 1.5 hours
Required
The average speed
Solution
The average speed : distance traveled divided by time taken or total distance divided by total elapsed time
Can be formulated :
avg speed = distance : time
avg speed = d : t
Input the value :
avg speed = 65 miles : 1,5 hours
avg speed = 43.33 miles per hours(mph)
A mixture of krypton and argon gas is compressed from a volume of to a volume of , while the pressure is held constant at . Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.
Answer:
42556.5 J
Explanation:
THIS IS THE COMPLETE QUESTION BELOW;
A mixture of krypton and neon gas is compressed from a volume of 96.0L to a volume of 68.0L , while the pressure is held constant at 15.0atm . Calculate the work done on the gas mixture. Be sure your answer has the correct sign (positive or negative) and the correct number of significant digits.
The workdone on the gas can be calculated using below expresion,
W = - PΔV
Where P= Pressure of the mixture of the given gases
ΔV = Change in volume
Given;
Initial volume of the mixture= 96.0L
= 96.0L/ 1000= 0.096m³
Final volume of the mixture= 68.0L
= 68.0L/1000= 0.068m³
Pressure= 15.0atm, but we need to convert to N/m² for unit consistency.
1 atm= 101325 N/m²
15 atm = X
Cross multiply
X = (15×101325 )
X= 1519875 N/m²
P= 1519875 N/m²
W = - PΔV
W= - 1519875 × (0.068 - 0.096)
= - 1519875 × -0.028 m³
W= 42556.5 J
the radius of magnesium atom is 0.160nm. the radius of a magnesium ion is 7.2x 10^-11m. explain the difference in size between the magnesium atom and magnesium ion
Answer:
during reaction magnesium lises ions.
Explanation:
magnesium reacts by losing two ions which makes it smaller in size.
An arctic weather balloon is filled with 4.96 L of helium gas inside a prep shed. The temperature inside the shed is 6. °C. The balloon is then taken outside, where the temperature is 2. °C. Calculate the new volume of the balloon.
The new volume of the balloon : V₂ = 4.89 L
Further explanationGiven
V₁ = 4.96 L
T₁ = 6 + 273 = 279 K
T₂ = 2 + 273 = 275 K
Required
The new volume
Solution
Charles's Law
When the gas pressure is kept constant, the gas volume is proportional to the temperature
[tex]\tt \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Input the value :
V₂=V₁.T₂/T₁
V₂ = 4.96 x 275 / 279
V₂ = 4.89 L
Kate made some ice cubes from pure water.
She used a sensor to measure the temperature of the ice.
What temperature will the sensor show when the ice is melting?
............. °C
Answer:
The correct answer is - 0 degrees Celsius or 32 degrees Fahrenheit.
Explanation:
The pure water freezes below zero degrees Celsius and forms ice which is started to melt at zero degrees Celsius as it gets the heat from the surroundings. The change in the heat or temperature of matter leads to a change in the state of matter.
Kate will find that the ice cubes formed from the pure water started to melt at 0 degrees Celsius or 32 degrees Fahrenheit with the help of sensor she has.
When N,N-Dimethylaniline is treated with bromine, ortho and para products are observed. However, when N,N-Dimethylaniline is treated with a mixture of nitric and sulfuric acid, only the meta product is observed. Explain these results. (Hint: what can happen to the nitrogen atom in the presence of the strong acids
Answer:
See explanation below
Explanation:
To get a better understanding watch the picture attached.
In the case of the reaction with Bromine, the -N(CH₃)₂ is a strong ring activator, therefore, it promotes a electrophilic aromatic sustitution, so, in the mechanism of reaction, the lone pair of the Nitrogen, will move to the ring by resonance and activate the ortho and para positions. That's why the bromine wil go to the ortho and para positions, mostly the para position, because the -N(CH₃)₂ cause a steric hindrance in the ortho position.
In the case of the reaction with HNO₃/H₂SO₄, the acid transform the -N(CH₃)₂ in a protonated form, the anilinium ion, which is a deactivating of the ring, and also a strong electron withdrawing, so, the electrophile will go to the meta position instead.
Hope this helps.
If you have 12 grams of H2 gas, .
how many moles do you have?
Answer:
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Explanation:
It is common to mix polar solvents (e.g., acetone) with non-polar solvents (e.g., hexane) to obtain an eluting solvent of intermediate polarity. Would it be appropriate to use a water-DMSO mixture
Answer:
No, it is not appropriate to mix water and DMSO
Explanation:
We have to realize that DMSO is a highly polar solvent and water is a highly polar solvent. The question explicitly says that our target is to produce a solvent of intermediate polarity.
We can only do this by mixing a polar and a nonpolar solvent. We have been given the example of the mixture of acetone/hexane which is quite a perfect mixture.
Thus, it is inappropriate to mix DMSO and water.
The water-DMSO mixture has a high polarity and is not appropriate for intermediate polarity solution.
The interactions between solute-solvent result in the solubility and the polarity of the solution. The polar and non-polar solvents result in intermediate polarity of the solution.
What is the polarity of Water-DMSO solute?The water and DMSO both are highly polar in nature. The addition of polar DMSO to polar water results in the dipole-dipole interaction between the molecules.
The interactions result in the solubility of the solute with solvent. However, the polarity of the solution will be high as both the molecules gave synergistic mixture polarity to the solution.
Thus, to obtain the solution of intermediate polarity, water-DMSO mixture is not appropriate.
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