# Gases Quiz 1

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Gas quiz 1

• 1.

### A glass column is filled with mercury and inverted in a pool of mercury.  The mercury column stabilizes at a height of 735 mm above the pool of mercury.  What is the pressure of the atmosphere?

• A.

0.697 atm

• B.

0.735 atm

• C.

0.967 atm

• D.

1.03 atm

• E.

194 atm

C. 0.967 atm
Explanation
When a glass column filled with mercury is inverted in a pool of mercury, the height of the mercury column stabilizes at 735 mm. This height represents the pressure exerted by the atmosphere, known as atmospheric pressure. To convert this height to atm, we use the conversion factor of 1 atm = 760 mmHg. Therefore, the atmospheric pressure is calculated as 735 mm / 760 mmHg = 0.967 atm.

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• 2.

### Consider three one-liter flasks at STP.  Flask A contains NH3 gas, flask B contains NO2 gas and flask C contains N2 gas.  Which contains the largest number of molecules

• A.

• B.

• C.

• D.

All are the same

• E.

None

D. All are the same
Explanation
The number of molecules in a gas is directly proportional to the number of moles of the gas. Since all three flasks have the same volume and are at the same temperature and pressure (STP), the ideal gas law can be used to determine the number of moles in each flask. The ideal gas law states that PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature. Since all three flasks have the same volume, pressure, and temperature, the number of moles in each flask is the same. Therefore, all three flasks contain the same number of molecules.

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• 3.

### Consider three one-liter flasks at STP.  Flask A contains NH3 gas, flask B contains NO2 gas and flask C contains N2 gas.  In which flask are the molecules least polar and therefore most ideal in behavior?

• A.

• B.

• C.

• D.

All are the same

• E.

None

Explanation
The molecules in flask C, which contains N2 gas, are least polar and therefore most ideal in behavior. This is because N2 is a diatomic molecule composed of two nitrogen atoms, which have similar electronegativities and do not have any significant difference in their electron distribution. As a result, N2 molecules do not have a permanent dipole moment and exhibit nonpolar behavior. In contrast, NH3 and NO2 molecules in flasks A and B, respectively, have polar bonds due to differences in electronegativity between the atoms involved, resulting in a permanent dipole moment.

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• 4.

### Consider three one-liter flasks at STP.  Flask A contains NH3 gas, flask B contains NO2 gas and flask C contains N2 gas.   In which flask do the molecules have the highest average velocity?

• A.

• B.

• C.

• D.

All are the same

• E.

None

Explanation
The molecules in flask A have the highest average velocity because ammonia (NH3) gas has a lower molar mass compared to nitrogen dioxide (NO2) gas and nitrogen (N2) gas. According to the kinetic theory of gases, the average velocity of gas molecules is inversely proportional to the square root of their molar mass. Therefore, since ammonia has the lowest molar mass among the three gases, its molecules will have the highest average velocity.

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• 5.

### Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.   In which flask do the molecules have the highest average kinetic energy?

• A.

• B.

• C.

• D.

None

• E.

All are the same

E. All are the same
Explanation
The average kinetic energy of gas molecules is directly proportional to the temperature of the gas. Since all three flasks are at STP (standard temperature and pressure), they are at the same temperature. Therefore, the molecules in all three flasks have the same average kinetic energy.

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• 6.

### Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.  Which flask contains the fewest ATOMS?

• A.

• B.

• C.

• D.

None

• E.

All are the same

Explanation
Flask A contains the fewest atoms because it is filled with the gas NO, which consists of only one nitrogen atom and one oxygen atom per molecule. Flask B contains NO2, which has one nitrogen atom and two oxygen atoms per molecule. Flask C contains N2O, which has two nitrogen atoms and one oxygen atom per molecule. Therefore, flask A has the fewest atoms.

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• 7.

### Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.  Which flask contains 1.0 mole of gas?

• A.

• B.

• C.

• D.

None

• E.

All are the same

D. None
Explanation
Since the question states that each flask is filled with a different gas, and each flask contains 1 liter of gas, it is not possible for any flask to contain 1.0 mole of gas. The number of moles of gas in a given volume depends on the molar mass of the gas. Since the molar masses of NO, NO2, and N2O are different, the number of moles of gas in each flask will be different. Therefore, none of the flasks contain 1.0 mole of gas.

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• 8.

### Consider three one-liter flasks labeled A, B, and C filled with the gases NO, NO2, and N2O, respectively, each at STP.  Which flask contains dinitrogen oxide?

• A.

• B.

• C.

• D.

None

• E.

All are the same

Explanation
Flask C contains dinitrogen oxide (N2O). This is because flask C is filled with N2O, which is the chemical formula for dinitrogen oxide. Flask A contains NO, which is nitric oxide, and flask B contains NO2, which is nitrogen dioxide. Therefore, only flask C contains dinitrogen oxide.

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• 9.

### Three 1.00 L flasks at 25oC and 725 torr contain the gases CH4 (flask A), CO2 (flask B), and C2H6 (flask C).   In which flask is there 0.039 mole of gas?

• A.

• B.

• C.

• D.

All

• E.

None

E. None
Explanation
The question states that each flask contains a different gas, CH4 in flask A, CO2 in flask B, and C2H6 in flask C. It also states that there is 0.039 mole of gas. However, it does not specify which gas the 0.039 mole belongs to. Therefore, we cannot determine which flask contains the 0.039 mole of gas. Hence, the answer is none.

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• 10.

### Three 1.00 L flasks at 25oC and 725 torr contain the gases CH4 (flask A), CO2 (flask B), and C2H6 (flask C).   In which single flask do the molecules have the greatest mass, the greatest average velocity, AND the highest kinetic energy?

• A.

• B.

• C.

• D.

All

• E.

None

E. None
Explanation
The mass of a gas is determined by its molar mass, which is the highest for CO2 (flask B) among the given options. The average velocity of gas molecules is determined by the temperature and molar mass, with lighter molecules having higher average velocities. CH4 (flask A) has the lowest molar mass, so its molecules will have the highest average velocity. The kinetic energy of gas molecules is directly proportional to their temperature. Since all the flasks are at the same temperature, they will have the same kinetic energy. Therefore, there is no single flask that has the greatest mass, greatest average velocity, and highest kinetic energy.

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• Current Version
• Mar 22, 2023
Quiz Edited by
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• Nov 01, 2009
Quiz Created by
Pszpila

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