Question 1

The rate of diffusion of a gas is inversely proportional to its molar mass.

Accepted Answer

A) True 
 B)False

Question 2

A gas evolved during the fermentation of sugar was collected at 22.5°C and 702 mmHg. After purification its volume was found to be 25.0 L. How many moles of gas were collected? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

Accepted Answer

A)   0.952 mol
B)   1.05 mol
C)   12.5 mol
D)   22.4 mol
E)   724 molF) C) and D)
G) B) and C)

Question 3

Give five examples of compounds that exist as gases at room temperature and atmospheric pressure.

Accepted Answer

(Answers will vary.)...

Question 4

The air pressure in a volleyball is 75 psi. What is this pressure in torr? (1 atm = 14.7 psi = 101,325 Pa = 760 torr) ?

Accepted Answer

A)   520 torr
B)   562 torr
C)   3900 torr
D)   7600 torr
E)   75,000 torrF) A) and B)
G) B) and C)

Question 5

Gases are sold in large cylinders for laboratory use. What pressure is exerted by 2.500 kg of oxygen gas (O2)  stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   3.55 atm
B)   1.51 ×103 atm
C)   47.3 atm
D)   7.56 × 104 atm
E)   10.2 atmF) B) and D)
G) A) and D)

Question 6

What is the initial pressure of a gas having an initial temperature of 905 K, an initial volume of 14.3 L, a final pressure of 0.83 atm, a final temperature of 154 K and a final volume of 2.7 L?

Accepted Answer

A)   26 atm
B)   0.27 atm
C)   0.75 atm
D)   1.3 atm
E)   0. 92 atmF) A) and B)
G) C) and D)

Question 7

What is the volume of NH3 produced in the following reaction when 3.0 L of N2 reacts with 4.0 L of H2 ? N2(g)  + 3H2(g)  → 2NH3(g)

Accepted Answer

A)   1.5 L
B)   2.7 L
C)   6.0 L
D)   7.5 L
E)   12 LF) C) and D)
G) A) and B)

Question 8

A compound composed of carbon, hydrogen, and chlorine effuses through a pinhole 0.411 times as fast as neon. What is the molecular formula of the compound?

Accepted Answer

A)   CHCl3
B)   CH2Cl2
C)   C2H2Cl2
D)   C2H3Cl
E)   CCl4F) A) and D)
G) A) and E)

Question 9

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning completely 1.00 L of octane (C8H18, density = 0.7025 g/mL) , yielding carbon dioxide and water? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   394 L
B)   1880 L
C)   8220 L
D)   8970 L
E)   17,900 LF) A) and E)
G) B) and C)

Question 10

A(n) ________ is a device used to measure the pressure of gases other than the atmosphere.

Accepted Answer

The answer of A(n) ________ is a device used to...

Question 11

A sample of nitrogen gas has a volume of 32.4 L at 20°C. The gas is heated to 220ºC at constant pressure. What is the final volume of the nitrogen gas?

Accepted Answer

A)   2.94 L
B)   19.3 L
C)   32.4 L
D)   54.5 L
E)   356 LF) C) and E)
G) B) and C)

Question 12

"The pressure of an ideal gas is inversely proportional to its volume at constant temperature and number of moles" is a statement of ________ law.

Accepted Answer

A)   Charles's
B)   Boyle's
C)   Amontons's
D)   Avogadro's
E)   Gay-Lussac'sF) A) and B)
G) D) and E)

Question 13

1.000 atm of oxygen gas, placed in a container having a pinhole opening in its side, leaks from the container 2.14 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of the following species could be the unknown gas?

Accepted Answer

A)   Cl2
B)   SF6
C)   Kr
D)   UF6
E)   XeF) B) and D)
G) C) and E)

Question 14

A sample of a gas occupies 1.40 L at 25°C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg?

Accepted Answer

A)   2.8 L
B)   2.10 L
C)   1.40 L
D)   1.05 L
E)   0.700 LF) None of the above
G) A) and D)

Question 15

In the van der Waals equation, the constant b is a constant that is part of a correction factor for ________.

Accepted Answer

A)   the volume of the gas
B)   the temperature of the gas
C)   the pressure of the gas
D)   the ideal gas constantE) B) and C)
F) A) and D)

Question 16

The Kelvin temperature scale is useful when comparing

Accepted Answer

A)   various gas samples at different densities.
B)   volume of a gas sample with temperature at constant pressure.
C)   pressure of gas samples at different volumes and constant temperature.
D)   various liquids at constant pressure.E) All of the above
F) A) and B)

Question 17

What is the pressure in atmospheres exerted by a column of mercury that is 100. m high? (density of mercury = 13.5951 g/cm3, gravitational constant = 9.80665 m/s2, 1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Accepted Answer

A)   1.4 × 1010 atm
B)   0.013 atm
C)   0.73 atm
D)   1.37 atm
E)   132 atmF) B) and C)
G) B) and E)

Question 18

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg. The empirical formula of the compound is CH2. What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   CH2
B)   C2H4
C)   C3H6
D)   C4H8
E)   C6H12F) A) and D)
G) A) and E)

Question 19

What is the standard pressure used for STP conditions?

Accepted Answer

1 atm or 7...

Question 20

Consider the following reaction. H2(g)  + I2(s)  → 2 HI(g) 
If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete? 2(g)  + I2(s)  → 2 HI(g)  If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete?   A)    B)    C)    D)    E)  None of these choices." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   2(g)  + I2(s)  → 2 HI(g)  If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete?   
A)     
B)     
C)     
D)     
E)   None of these choices." class="answers-bank-image d-inline" rel="preload" >
B)   2(g)  + I2(s)  → 2 HI(g)  If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete?   
A)     
B)     
C)     
D)     
E)   None of these choices." class="answers-bank-image d-inline" rel="preload" >
C)   2(g)  + I2(s)  → 2 HI(g)  If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete?   
A)     
B)     
C)     
D)     
E)   None of these choices." class="answers-bank-image d-inline" rel="preload" >
D)   2(g)  + I2(s)  → 2 HI(g)  If the cylinder with a movable piston below contains 1 mol H2(g)  and 1 mol I2(s) , which represents the cylinder after the reaction is complete?   
A)     
B)     
C)     
D)     
E)   None of these choices." class="answers-bank-image d-inline" rel="preload" >
E)   None of these choices.F) D) and E)
G) C) and E)

Exam 10: Gases

What is the pressure in atmospheres exerted by a column of mercury that is 100. m high? (density of mercury = 13.5951 g/cm3, gravitational constant = 9.80665 m/s2, 1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Correct AnswerverifiedShow Answer

A compound composed of carbon, hydrogen, and chlorine effuses through a pinhole 0.411 times as fast as neon. What is the molecular formula of the compound?

Correct AnswerverifiedShow Answer

A gas evolved during the fermentation of sugar was collected at 22.5°C and 702 mmHg. After purification its volume was found to be 25.0 L. How many moles of gas were collected? (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg)

Correct AnswerverifiedShow Answer

What is the volume of NH3 produced in the following reaction when 3.0 L of N2 reacts with 4.0 L of H2 ? N2(g) + 3H2(g) → 2NH3(g)

Correct AnswerverifiedShow Answer

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg. The empirical formula of the compound is CH2. What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

The air pressure in a volleyball is 75 psi. What is this pressure in torr? (1 atm = 14.7 psi = 101,325 Pa = 760 torr) ?

Correct AnswerverifiedShow Answer

The Kelvin temperature scale is useful when comparing

Correct AnswerverifiedShow Answer

What is the standard pressure used for STP conditions?

Correct Answerverified1 atm or 7...View AnswerShow Answer

What is the initial pressure of a gas having an initial temperature of 905 K, an initial volume of 14.3 L, a final pressure of 0.83 atm, a final temperature of 154 K and a final volume of 2.7 L?

Correct AnswerverifiedShow Answer

1.000 atm of oxygen gas, placed in a container having a pinhole opening in its side, leaks from the container 2.14 times faster than does 1.000 atm of an unknown gas placed in this same apparatus. Which of the following species could be the unknown gas?

Correct AnswerverifiedShow Answer

"The pressure of an ideal gas is inversely proportional to its volume at constant temperature and number of moles" is a statement of ________ law.

Correct AnswerverifiedShow Answer

A sample of nitrogen gas has a volume of 32.4 L at 20°C. The gas is heated to 220ºC at constant pressure. What is the final volume of the nitrogen gas?

Correct AnswerverifiedShow Answer

A sample of a gas occupies 1.40 L at 25°C and 760 mmHg. What volume will it occupy at the same temperature and 380 mmHg?

Correct AnswerverifiedShow Answer

In the van der Waals equation, the constant b is a constant that is part of a correction factor for ________.

Correct AnswerverifiedShow Answer

A(n) ________ is a device used to measure the pressure of gases other than the atmosphere.

Correct AnswerverifiedShow Answer

Give five examples of compounds that exist as gases at room temperature and atmospheric pressure.

Correct Answerverified(Answers will vary.)...View AnswerShow Answer

Gases are sold in large cylinders for laboratory use. What pressure is exerted by 2.500 kg of oxygen gas (O2) stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

The rate of diffusion of a gas is inversely proportional to its molar mass.

Correct AnswerverifiedShow Answer

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning completely 1.00 L of octane (C8H18, density = 0.7025 g/mL) , yielding carbon dioxide and water? (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

Consider the following reaction. H2(g) + I2(s) → 2 HI(g) If the cylinder with a movable piston below contains 1 mol H2(g) and 1 mol I2(s) , which represents the cylinder after the reaction is complete?

Correct AnswerverifiedShow Answer

What is the pressure in atmospheres exerted by a column of mercury that is 100. m high? (density of mercury = 13.5951 g/cm³, gravitational constant = 9.80665 m/s², 1 atm = 101,325 Pa = 760 torr = 760 mmHg)

Correct Answer
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Correct Answer
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Correct Answer
verified

What is the volume of NH₃ produced in the following reaction when 3.0 L of N₂ reacts with 4.0 L of H₂ ? N₂(g) + 3H₂(g) → 2NH₃(g)

Correct Answer
verified

A 0.271-g sample of an unknown vapor occupies 294 mL at 140°C and 847 mmHg. The empirical formula of the compound is CH₂. What is the molecular formula of the compound? (R = 0.08206 L • atm/K • mol)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
1 atm or 7...
View Answer

Correct Answer
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Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
(Answers will vary.)...
View Answer

Gases are sold in large cylinders for laboratory use. What pressure is exerted by 2.500 kg of oxygen gas (O₂) stored at 22°C in a 40.0-L cylinder? (R = 0.08206 L • atm/K • mol)

Correct Answer
verified

Correct Answer
verified

The mole fraction of oxygen molecules in dry air is 0.2095. What volume of dry air at 1.00 atm and 25°C is required for burning completely 1.00 L of octane (C₈H₁₈, density = 0.7025 g/mL) , yielding carbon dioxide and water? (R = 0.08206 L • atm/K • mol)

Correct Answer
verified

Consider the following reaction. H₂(g) + I₂(s) → 2 HI(g) If the cylinder with a movable piston below contains 1 mol H₂(g) and 1 mol I₂(s) , which represents the cylinder after the reaction is complete?

Correct Answer
verified