Question 1

Zinc reacts with aqueous sulfuric acid to form hydrogen gas:
2 is collected over water at 27 °C and a barometric pressure of 733 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is _ atm. A)  0.964 B)  706 C)  760 D)  0.929 E)  1.00" class="answers-bank-image d-inline" rel="preload" >
In an experiment, 201 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 733 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is _ atm.

Accepted Answer

A)   0.964
B)   706
C)   760
D)   0.929
E)   1.00

Question 2

Which statement about ideal behavior of gases is false?

Accepted Answer

A)   Volume of 2.00 moles of oxygen gas, O2, is assumed to be the same as that of 2.00 moles of carbon dioxide gas, CO2, as long as the temperature and pressure conditions are the same.
B)   Low pressures and high temperatures typically cause deviations from the ideal gas behavior.
C)   At low densities all gases have similar properties.
D)   All particles in the ideal gas behave independently of each other.
E)   Gas ideality assumes that there are no interactions between gas particles.

Question 3

At STP, the ratio of the root- mean- square speed of CO2 to that of SO2 is _ .

Accepted Answer

A)   1.000
B)   1.207
C)   1.456
D)   2.001
E)   2.119

Question 4

Which of the following is not part of the kinetic- molecular theory?

Accepted Answer

A)   Collisions between gas molecules do not result in the loss of energy.
B)   Attractive and repulsive forces between gas molecules are negligible.
C)   Gases consist of molecules in continuous, random motion.
D)   Atoms are neither created nor destroyed by ordinary chemical reactions.
E)   The volume occupied by all of the gas molecules in a container is negligible compared to the volume of the container.

Question 5

A sample of an ideal gas (3.00 L)  in a closed container at 25.0 °C and 76.0 torr is heated to 300 °C. The pressure of the gas at this temperature is torr.

Accepted Answer

A)   2.53 × 10- 2
B)   39.5
C)   912
D)   146
E)   76.5

Question 6

A gas at a pressure of 10.0 Pa exerts a force of N on an area of 5.5 m2.

Accepted Answer

A)   1.8
B)   55
C)   0.55
D)   18
E)   5.5

Question 7

The root- mean- square speed of CO at 113 °C is m/s.

Accepted Answer

A)   58.3
B)   317
C)   586
D)   31.5
E)   993

Question 8

Arrange the following gases in order of increasing average molecular speed at 25 °C. 2 2 2 2 B)  Cl2 2 2 2 C)  Cl2 2 2 2 D)  F2 2 2 2 E)  N2 2 2 2" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Cl2 2 2 2
B)   Cl2 2 2 2
C)   Cl2 2 2 2
D)   F2 2 2 2
E)   N2 2 2 2

Question 9

Which noble gas is expected to show the largest deviations from the ideal gas behavior?

Accepted Answer

A)   neon
B)   helium
C)   krypton
D)   xenon
E)   argon

Question 10

A sample of O2 gas (2.0 mmol)  effused through a pinhole in 5.0 s. It will take s for the same amount of CO2 to effuse under the same conditions.

Accepted Answer

A)   6.9
B)   3.6
C)   4.3
D)   5.9
E)   0.23

Question 11

A sample of He gas (2.35 mol)  occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is L at 423 K and 1.00 atm.

Accepted Answer

A)   81.6
B)   41.1
C)   1.41
D)   0.709
E)   57.9

Question 12

Removal of _ from the natural gas both purifies the natural gas and serves as an alternative method of production of an industrially important chemical element.

Accepted Answer

A)   CO2 
B)   As2O3 
C)   H2S
D)   He
E)   NH3

Question 13

Gaseous mixtures .

Accepted Answer

A)   are all heterogeneous
B)   can only contain molecules
C)   are all homogeneous
D)   can only contain isolated atoms
E)   must contain both isolated atoms and molecules

Question 14

"Isothermal" means .

Accepted Answer

A)   that OHrxn = 0
B)   at variable temperature and pressure conditions
C)   at constant temperature
D)   at ideal temperature and pressure conditions
E)   at constant pressure

Question 15

What volume (mL)  of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq) , when the final SO2 pressure is 827 torr at 44.0 °C?

Accepted Answer

A)   1.00 × 10- 3
B)   761
C)   578
D)   0.106
E)   1.39 × 10- 4

Question 16

A sample of N2 gas (2.0 mmol)  effused through a pinhole in 5.5 s. It will take s for the same amount of CH4 to effuse under the same conditions.

Accepted Answer

A)   3.1
B)   7.3
C)   9.6
D)   5.5
E)   4.2

Question 17

Given the equation  
Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

Accepted Answer

Question 18

Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation:
2NaN3 (s)  - 2Na (s)  + 3N2 (g) .
What mass (g)  of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?

Accepted Answer

A)   1.09
B)   160
C)   1.64
D)   71.1
E)   107

Question 19

Of the following, has a slight odor of bitter almonds and is toxic.

Accepted Answer

A)   NH3 
B)   HCN
C)   CO
D)   CH4 
E)   N2O

Question 20

Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature?

Accepted Answer

A)   LiCl
B)   HCl
C)   CH4 
D)   Cl2 
E)   H2

Exam 10: Gases

A sample of He gas (2.35 mol) occupies 57.9 L at 300.0 K and 1.00 atm. The volume of this sample is L at 423 K and 1.00 atm.

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Arrange the following gases in order of increasing average molecular speed at 25 °C.

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Molecular compounds of low molecular weight tend to be gases at room temperature. Which of the following is most likely not a gas at room temperature?

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A sample of O2 gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take s for the same amount of CO2 to effuse under the same conditions.

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A sample of N2 gas (2.0 mmol) effused through a pinhole in 5.5 s. It will take s for the same amount of CH4 to effuse under the same conditions.

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A sample of an ideal gas (3.00 L) in a closed container at 25.0 °C and 76.0 torr is heated to 300 °C. The pressure of the gas at this temperature is torr.

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"Isothermal" means .

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A gas at a pressure of 10.0 Pa exerts a force of N on an area of 5.5 m2.

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Given the equation Determine the number of liters of CO2 formed at STP. when 240.0 grams of C2H6 is burned in excess oxygen gas.

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Removal of _ from the natural gas both purifies the natural gas and serves as an alternative method of production of an industrially important chemical element.

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At STP, the ratio of the root- mean- square speed of CO2 to that of SO2 is _ .

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What volume (mL) of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq) , when the final SO2 pressure is 827 torr at 44.0 °C?

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Zinc reacts with aqueous sulfuric acid to form hydrogen gas: In an experiment, 201 mL of wet H2 is collected over water at 27 °C and a barometric pressure of 733 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is _ atm.

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Gaseous mixtures .

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Which noble gas is expected to show the largest deviations from the ideal gas behavior?

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Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN3 (s) - 2Na (s) + 3N2 (g) . What mass (g) of NaN3 is required to provide 40.0 L of N2 at 25.0 °C and 763 torr?

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Of the following, has a slight odor of bitter almonds and is toxic.

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The root- mean- square speed of CO at 113 °C is m/s.

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Which of the following is not part of the kinetic- molecular theory?

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Which statement about ideal behavior of gases is false?

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A sample of O₂gas (2.0 mmol) effused through a pinhole in 5.0 s. It will take s for the same amount of CO₂to effuse under the same conditions.

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A sample of N₂gas (2.0 mmol) effused through a pinhole in 5.5 s. It will take s for the same amount of CH₄to effuse under the same conditions.

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A gas at a pressure of 10.0 Pa exerts a force of N on an area of 5.5 m².

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Given the equation Determine the number of liters of CO₂formed at STP. when 240.0 grams of C₂H₆is burned in excess oxygen gas.

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At STP, the ratio of the root- mean- square speed of CO₂to that of SO₂is _ .

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What volume (mL) of sulfur dioxide can be produced by the complete reaction of 3.82 g of calcium sulfite with excess HCl (aq) , when the final SO₂pressure is 827 torr at 44.0 °C?

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Zinc reacts with aqueous sulfuric acid to form hydrogen gas: In an experiment, 201 mL of wet H₂is collected over water at 27 °C and a barometric pressure of 733 torr. The vapor pressure of water at 27 °C is 26.74 torr. The partial pressure of hydrogen in this experiment is _ atm.

Correct Answer
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Automobile air bags use the decomposition of sodium azide as their source of gas for rapid inflation: 2NaN₃(s) - 2Na (s) + 3N₂(g) . What mass (g) of NaN₃is required to provide 40.0 L of N₂at 25.0 °C and 763 torr?

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