Question 1

What volume of CO2 gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO3? CaCO3(s)  → CaO(s)  + CO2(g) 
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   0.449 L
B)   22.4 L
C)   25.0 L
D)   34.8 L
E)   45.7 mLF) D) and E)
G) C) and D)

Question 2

Calculate the volume of H2(g)  at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s)  to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   0.56 L
B)   1.12 L
C)   2.23 L
D)   4.47 L
E)   3.54 LF) A) and E)
G) D) and E)

Question 3

For a substance that remains a gas under all of the conditions listed, deviation from the ideal gas law would be most pronounced at

Accepted Answer

A)   100°C and 2.0 atm.
B)   0°C and 2.0 atm.
C)   -100°C and 2.0 atm.
D)   -100°C and 4.0 atm.
E)   100°C and 4.0 atm.F) B) and E)
G) A) and B)

Question 4

A gas cylinder containing 1.50 mol compressed methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C? (R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   9.00 × 10-2 atm
B)   0.933 atm
C)   1.11 atm
D)   1.70 atm
E)   11.1 atmF) A) and E)
G) C) and E)

Question 5

What is the temperature in Celsius at 77 K, which is the normal boiling point of liquid nitrogen?

Accepted Answer

A)   -350°C
B)   -196°C
C)   350°C
D)   196°C
E)   3.55°CF) A) and B)
G) C) and E)

Question 6

________ ________ is the pressure exerted by the Earth's atmosphere.

Accepted Answer

Atmospheri...

Question 7

A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO2. What is the molecular formula of the compound?

Accepted Answer

A)   NO2
B)   N4O8
C)   N3O6
D)   N2O4
E)   N5O10F) A) and C)
G) A) and B)

Question 8

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Accepted Answer

A)   348 cm
B)   1.00 × 102 ft
C)   18.8 mm
D)   33.8 ft
E)   76.0 cmF) B) and D)
G) A) and C)

Question 9

A sample of a gas has an initial pressure of 0.987 atm and a volume of 12.8 L. What is the final pressure if the volume is increased to 25.6 L?

Accepted Answer

A)   2.03 atm
B)   1.97 atm
C)   0.494 atm
D)   0.003 atm
E)   323.4 atmF) B) and D)
G) D) and E)

Question 10

Select the gas with the largest root-mean-square molecular speed at 25°C.

Accepted Answer

A)   NH3
B)   CO
C)   H2
D)   SF6
E)   All the gases have the same root-mean-square molecular speed at 25°C.F) All of the above
G) A) and B)

Question 11

Give five examples of elements that occur as gases at room temperature and pressure.

Accepted Answer

(Answers will vary.)...

Question 12

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

Accepted Answer

A)   25.2 L
B)   30.6 L
C)   33.6 L
D)   37.1 L
E)   49.2 LF) A) and C)
G) B) and C)

Question 13

A sample of an ideal gas has its volume doubled while its temperature remains constant. If the original pressure was 100 torr, what is the new pressure?

Accepted Answer

A)   10 torr
B)   50 torr
C)   100 torr
D)   200 torr
E)   1000 torrF) D) and E)
G) A) and B)

Question 14

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

Accepted Answer

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

Question 15

If a fixed amount of a gas is at a pressure of 2.71 atm and has a volume of 85.3 L at a temperature of 173.4 K, what is the final temperature of the gas if the pressure changes to 1.04 atm in a 105.3 L container?

Accepted Answer

A)   49.8 K
B)   75.9 K
C)   366.0 K
D)   82.1 K
E)   557.8 KF) A) and B)
G) B) and E)

Question 16

What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 in excess HCl(aq) ? MnO2(s)  + 4HCl(aq)  → MnCl2(aq)  + 2H2O(l)  + Cl2(g) 
(R = 0.08206 L • atm/K • mol)

Accepted Answer

A)   5.36 × 10-3 L
B)   0.138 L
C)   0.282 L
D)   3.09 L
E)   3.55 LF) C) and D)
G) A) and B)

Question 17

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310. mL?

Accepted Answer

A)   0.186 L
B)   0.251 L
C)   0.383 L
D)   0.410 L
E)   0.517 LF) B) and D)
G) None of the above

Question 18

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol, 1 atm = 101,325 Pa)

Accepted Answer

A)   0.232 g/L
B)   0.279 g/L
C)   0.994 g/L
D)   1.74 g/L
E)   2.09 g/LF) B) and E)
G) B) and D)

Question 19

When a closed-ended manometer is used for pressure measurements, and the closed end is under vacuum, the level of manometer liquid in the closed arm can never be lower than that in the other arm.

Accepted Answer

A) True 
 B)False

Question 20

Which represents the definition of pressure?

Accepted Answer

A)   volume/density
B)   temperature × area
C)   moles/volume
D)   force/area
E)   volume × forceF) B) and E)
G) C) and E)

Exam 10: Gases

Give five examples of elements that occur as gases at room temperature and pressure.

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

________ ________ is the pressure exerted by the Earth's atmosphere.

Correct AnswerverifiedAtmospheri...View AnswerShow Answer

When a closed-ended manometer is used for pressure measurements, and the closed end is under vacuum, the level of manometer liquid in the closed arm can never be lower than that in the other arm.

Correct AnswerverifiedShow Answer

A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm3; the density of water is 1.00 g/cm3.

Correct AnswerverifiedShow Answer

Calculate the volume of H2(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

A sample of propane, a component of LP gas, has a volume of 35.3 L at 315 K and 922 torr. What is its volume at STP? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

Correct AnswerverifiedShow Answer

Select the gas with the largest root-mean-square molecular speed at 25°C.

Correct AnswerverifiedShow Answer

What is the temperature in Celsius at 77 K, which is the normal boiling point of liquid nitrogen?

Correct AnswerverifiedShow Answer

What is the density of carbon dioxide gas at -25.2°C and 98.0 kPa? (R = 0.08206 L • atm/K • mol, 1 atm = 101,325 Pa)

Correct AnswerverifiedShow Answer

A sample of nitrogen gas has the temperature drop from 250.°C to 150.°C at constant pressure. What is the final volume if the initial volume is 310. mL?

Correct AnswerverifiedShow Answer

If a fixed amount of a gas is at a pressure of 2.71 atm and has a volume of 85.3 L at a temperature of 173.4 K, what is the final temperature of the gas if the pressure changes to 1.04 atm in a 105.3 L container?

Correct AnswerverifiedShow Answer

Which represents the definition of pressure?

Correct AnswerverifiedShow Answer

A sample of an ideal gas has its volume doubled while its temperature remains constant. If the original pressure was 100 torr, what is the new pressure?

Correct AnswerverifiedShow Answer

What volume of CO2 gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO3? CaCO3(s) → CaO(s) + CO2(g) (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO2 in excess HCl(aq) ? MnO2(s) + 4HCl(aq) → MnCl2(aq) + 2H2O(l) + Cl2(g) (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

A gas cylinder containing 1.50 mol compressed methane has a volume of 3.30 L. What pressure does the methane exert on the walls of the cylinder if its temperature is 25°C? (R = 0.08206 L • atm/K • mol)

Correct AnswerverifiedShow Answer

A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO2. What is the molecular formula of the compound?

Correct AnswerverifiedShow Answer

For a substance that remains a gas under all of the conditions listed, deviation from the ideal gas law would be most pronounced at

Correct AnswerverifiedShow Answer

A sample of a gas has an initial pressure of 0.987 atm and a volume of 12.8 L. What is the final pressure if the volume is increased to 25.6 L?

Correct AnswerverifiedShow Answer

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

is the pressure exerted by the Earth's atmosphere.

Correct Answer
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Atmospheri...
View Answer

Correct Answer
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A pressure that will support a column of Hg to a height of 256 mm would support a column of water to what height? The density of mercury is 13.6 g/cm³; the density of water is 1.00 g/cm³.

Correct Answer
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Calculate the volume of H₂(g) at 273 K and 2.00 atm that will be formed when 275 mL of 0.725 M HCl solution reacts with 50.0 g Zn(s) to give hydrogen gas and aqueous zinc chloride. (R = 0.08206 L • atm/K • mol)

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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What volume of CO₂ gas at 645 torr and 800. K could be produced by the decomposition of 45.0 g of CaCO₃? CaCO₃(s) → CaO(s) + CO₂(g) (R = 0.08206 L • atm/K • mol)

Correct Answer
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Correct Answer
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What volume of chlorine gas at 25°C and 0.950 atm can be produced by the reaction of 12.0 g of MnO₂ in excess HCl(aq) ? MnO₂(s) + 4HCl(aq) → MnCl₂(aq) + 2H₂O(l) + Cl₂(g) (R = 0.08206 L • atm/K • mol)

Correct Answer
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Correct Answer
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A 1.325 g sample of an unknown vapor occupies 368 mL at 114°C and 946 mm Hg. The empirical formula of the compound is NO₂. What is the molecular formula of the compound?

Correct Answer
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Correct Answer
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Correct Answer
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