Question 1

A sample of He gas (3.0 L) at 5.6 atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25 °C at constant temperature in a 9.0 L flask. The total pressure in the flask was __________ atm. Assume the initial pressure in the flask was 0.00 atm and the temperature upon mixing was 25°C.

Accepted Answer

A)  2.6
B)  9.2
C)  1.0
D)  3.7
E)  24

Question 2

The density of ammonia gas in a 4.32 L container at 837 torr and 45.0°C is __________ g/L.

Accepted Answer

A)  3.86
B)  0.719
C)  0.432
D)  0.194
E)  4.22 × 10-2

Question 3

The density of krypton gas at 1.21 atm and 50.0°C is __________ g/L.

Accepted Answer

A)  0.0456
B)  0.262
C)  0.295
D)  3.82
E)  7.65

Question 4

10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0°C. The partial pressure of neon is __________ atm.

Accepted Answer

A)  20.4
B)  8.70
C)  0.700
D)  3.40
E)  5.60

Question 5

The reaction of 50 mL of Cl2 gas with 50 mL of C2H4 gas via the equation: Cl2 (g) + C2H4 (g) → C2H4Cl2 (g) 
Will produce a total of __________ mL of products if pressure and temperature are kept constant.

Accepted Answer

A)  100
B)  50
C)  25
D)  125
E)  150

Question 6

The molecular weight of a gas that has a density of 5.75 g/L at STP is __________ g/mol.

Accepted Answer

A)  3.90
B)  129
C)  141
D)  578
E)  1.73 × 10-3

Question 7

Zinc reacts with aqueous sulfuric acid to form hydrogen gas: Zn (s) + H2SO4 (aq) → ZnSO4 (aq) + H2 (g) 
In an experiment, 225 mL of wet H2 is collected over water at 27°C and a barometric pressure of 748 torr. How many grams of Zn have been consumed? The vapor pressure of water at 27°C is 26.74 torr.

Accepted Answer

A)  4.79 × 106
B)  0.567
C)  567
D)  431
E)  4.31 × 105

Question 8

A gas mixture of N2 and CO2 has a total pressure of 8.00 atm and contains 12.5 mol of gas. If the partial pressure of N2 is 3.69 atm, how many moles of CO2 are in the mixture?

Accepted Answer

A)  5.77
B)  3.69
C)  4.31
D)  11.0
E)  6.73

Question 9

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 26.5 L of N2 at 22.0°C and 1.10 atm?

Accepted Answer

A)  52.2
B)  700.
C)  0.807
D)  1.21
E)  1.10

Question 10

According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200°C?

Accepted Answer

A)  HCl
B)  Cl2
C)  H2O
D)  SF6
E)  None. The molecules of all gases have the same root-mean-square speed at any given temperature.

Question 11

The volume of an ideal gas is zero at __________.

Accepted Answer

A)  0 °C
B)  -45 °F
C)  -273 K
D)  -363 K
E)  -273 °C

Question 12

If 3.21 mol of a gas occupies 56.2 L at 44°C and 793 torr, 5.21 mol of this gas occupies __________ L under these conditions.

Accepted Answer

A)  14.7
B)  61.7
C)  30.9
D)  91.2
E)  478 D

Question 13

A mixture of carbon dioxide and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times as long to escape as the unknown gas. Which one could be the unknown gas?

Accepted Answer

A)  Cl2
B)  CO
C)  HCl
D)  H2
E)  SO2

Question 14

A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr. The temperature of the gas is __________°C.

Accepted Answer

A)  20.3
B)  -253
C)  -20.3
D)  203
E)  22.4

Question 15

The pressure exerted by a column of liquid is equal to the product of the height of the column times the gravitational constant times the density of the liquid, P = ghd. How high a column of water (d = 1.0 g/mL) would be supported by a pressure that supports a 713 mm column of mercury (d = 13.6 g/mL) ?

Accepted Answer

A)  14 mm
B)  52 mm
C)  713 mm
D)  1.2 × 104 mm
E)  9.7 × 103 mm

Question 16

A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr is __________.

Accepted Answer

A)  4.04
B)  0.247
C)  2.01
D)  0.497
E)  16.3

Question 17

The density of __________ is 0.900 g/L at STP.

Accepted Answer

A)  CH4
B)  Ne
C)  CO
D)  N2
E)  NO

Question 18

A real gas will behave most like an ideal gas under conditions of __________.

Accepted Answer

A)  high temperature and high pressure
B)  high temperature and low pressure
C)  low temperature and high pressure
D)  low temperature and low pressure
E)  STP B

Question 19

How many moles of gas are there in a 50.0 L container at 22.0°C and 825 torr?

Accepted Answer

A)  2.29 × 104
B)  1.70 × 103
C)  2.23
D)  0.603
E)  18.4 C

Question 20

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0°C. The total pressure in the container was __________ atm.

Accepted Answer

A)  10.3
B)  4.02
C)  6.31
D)  0.292
E)  1.60

Exam 10: Gases

A sample of He gas (3.0 L) at 5.6 atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25 °C at constant temperature in a 9.0 L flask. The total pressure in the flask was __________ atm. Assume the initial pressure in the flask was 0.00 atm and the temperature upon mixing was 25°C.

Correct Answer
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The density of ammonia gas in a 4.32 L container at 837 torr and 45.0°C is __________ g/L.

Correct Answer
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The density of krypton gas at 1.21 atm and 50.0°C is __________ g/L.

Correct Answer
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10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0°C. The partial pressure of neon is __________ atm.

Correct Answer
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The reaction of 50 mL of Cl₂ gas with 50 mL of C₂H₄ gas via the equation: Cl₂ (g) + C₂H₄ (g) → C₂H₄Cl₂ (g) Will produce a total of __________ mL of products if pressure and temperature are kept constant.

Correct Answer
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The molecular weight of a gas that has a density of 5.75 g/L at STP is __________ g/mol.

Correct Answer
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Correct Answer
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A gas mixture of N₂ and CO₂ has a total pressure of 8.00 atm and contains 12.5 mol of gas. If the partial pressure of N₂ is 3.69 atm, how many moles of CO₂ are in the mixture?

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 NaN₃ is required to provide 26.5 L of N₂ at 22.0°C and 1.10 atm?

Correct Answer
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According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200°C?

Correct Answer
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The volume of an ideal gas is zero at __________.

Correct Answer
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If 3.21 mol of a gas occupies 56.2 L at 44°C and 793 torr, 5.21 mol of this gas occupies __________ L under these conditions.

Correct Answer
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D

A mixture of carbon dioxide and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times as long to escape as the unknown gas. Which one could be the unknown gas?

Correct Answer
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A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr. The temperature of the gas is __________°C.

Correct Answer
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Correct Answer
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A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr is __________.

Correct Answer
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The density of __________ is 0.900 g/L at STP.

Correct Answer
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A real gas will behave most like an ideal gas under conditions of __________.

Correct Answer
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B

How many moles of gas are there in a 50.0 L container at 22.0°C and 825 torr?

Correct Answer
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C

CO (5.00 g) and CO₂ (5.00 g) were placed in a 750.0 mL container at 50.0°C. The total pressure in the container was __________ atm.

Correct Answer
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Exam 10: Gases

A sample of He gas (3.0 L) at 5.6 atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25 °C at constant temperature in a 9.0 L flask. The total pressure in the flask was __________ atm. Assume the initial pressure in the flask was 0.00 atm and the temperature upon mixing was 25°C.

Correct AnswerverifiedShow Answer

The density of ammonia gas in a 4.32 L container at 837 torr and 45.0°C is __________ g/L.

Correct AnswerverifiedShow Answer

The density of krypton gas at 1.21 atm and 50.0°C is __________ g/L.

Correct AnswerverifiedShow Answer

10.0 grams of argon and 20.0 grams of neon are placed in a 1200.0 ml container at 25.0°C. The partial pressure of neon is __________ atm.

Correct AnswerverifiedShow Answer

The reaction of 50 mL of Cl2 gas with 50 mL of C2H4 gas via the equation: Cl2 (g) + C2H4 (g) → C2H4Cl2 (g) Will produce a total of __________ mL of products if pressure and temperature are kept constant.

Correct AnswerverifiedShow Answer

The molecular weight of a gas that has a density of 5.75 g/L at STP is __________ g/mol.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A gas mixture of N2 and CO2 has a total pressure of 8.00 atm and contains 12.5 mol of gas. If the partial pressure of N2 is 3.69 atm, how many moles of CO2 are in the mixture?

Correct AnswerverifiedShow Answer

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 26.5 L of N2 at 22.0°C and 1.10 atm?

Correct AnswerverifiedShow Answer

According to kinetic-molecular theory, in which of the following gases will the root-mean-square speed of the molecules be the highest at 200°C?

Correct AnswerverifiedShow Answer

The volume of an ideal gas is zero at __________.

Correct AnswerverifiedShow Answer

If 3.21 mol of a gas occupies 56.2 L at 44°C and 793 torr, 5.21 mol of this gas occupies __________ L under these conditions.

Correct AnswerverifiedD

A mixture of carbon dioxide and an unknown gas was allowed to effuse from a container. The carbon dioxide took 1.25 times as long to escape as the unknown gas. Which one could be the unknown gas?

Correct AnswerverifiedShow Answer

A 0.133 mol sample of gas in a 525 mL container has a pressure of 312 torr. The temperature of the gas is __________°C.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A tank containing both HF and HBr gases developed a leak. The ratio of the rate of effusion of HF to the rate of effusion of HBr is __________.

Correct AnswerverifiedShow Answer

The density of __________ is 0.900 g/L at STP.

Correct AnswerverifiedShow Answer

A real gas will behave most like an ideal gas under conditions of __________.

Correct AnswerverifiedB

How many moles of gas are there in a 50.0 L container at 22.0°C and 825 torr?

Correct AnswerverifiedC

CO (5.00 g) and CO2 (5.00 g) were placed in a 750.0 mL container at 50.0°C. The total pressure in the container was __________ atm.

Correct AnswerverifiedShow Answer

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The reaction of 50 mL of Cl₂ gas with 50 mL of C₂H₄ gas via the equation: Cl₂ (g) + C₂H₄ (g) → C₂H₄Cl₂ (g) Will produce a total of __________ mL of products if pressure and temperature are kept constant.

Correct Answer
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A gas mixture of N₂ and CO₂ has a total pressure of 8.00 atm and contains 12.5 mol of gas. If the partial pressure of N₂ is 3.69 atm, how many moles of CO₂ are in the mixture?

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 NaN₃ is required to provide 26.5 L of N₂ at 22.0°C and 1.10 atm?

Correct Answer
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D

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B

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C

CO (5.00 g) and CO₂ (5.00 g) were placed in a 750.0 mL container at 50.0°C. The total pressure in the container was __________ atm.

Correct Answer
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