Question 1

What is the definition of a "gas"?

Accepted Answer

A "gas" is a substance in whic...

Question 2

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H2(g) at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Accepted Answer

A)  3.4 × 10-3 L
B)  2.2 L
C)  2.9 L
D)  5.8 L
E)  11.7 LF) A) and B)
G) A) and C) C

Question 3

Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

Accepted Answer

The answer of Calculate the molar mass of a gaseous...

Question 4

How many atoms of He gas are present in a 450 mL container at 35°C and 740 mmHg?

Accepted Answer

A)  0.017 He atoms
B)  0.068 He atoms
C)  1.2 x 105 He atoms
D)  1.0 x 1022 He atoms
E)  7.9 x 1024 He atomsF) C) and E)
G) B) and E)

Question 5

What is standard temperature and standard pressure in units of °C and atm?

Accepted Answer

0°C and 1 ...

Question 6

Gasoline (which can be considered to be octane, C8H18)burns in oxygen to produce carbon dioxide and water.What volume (L)of oxygen at STP is necessary to react with 1.0 gal of gasoline?
(The density of gasoline is 0.81 g/mL.1 gal = 3.78 L)

Accepted Answer

Question 7

A sample of pure nitrogen has a temperature of 15 °C.What is the temperature of the nitrogen in units of Kelvin?

Accepted Answer

A)  300 K
B)  290 K
C)  288 K
D)  288.2 K
E)  288.15 KF) A) and D)
G) None of the above

Question 8

Calculate the density, in g/L, of SF6 gas at 27°C and 0.500 atm pressure.

Accepted Answer

A)  3.38 × 10-3 g/L
B)  2.96 g/L
C)  22.4 g/L
D)  32.9 g/L
E)  3.38 kg/LF) B) and E)
G) A) and D)

Question 9

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what is the final pressure (atm)of the gas?

Accepted Answer

The answer of The following data describes an initial and...

Question 10

Which of the following describes Dalton's Law?

Accepted Answer

A)  The pressure of a gas is proportional to its volume
B)  The total pressure of a gas mixture is the sum of the partial pressures of each gas in the mixture
C)  The temperature of a gas is proportional to its volume
D)  Only one variable can be changed from an initial state to a final state for a gasE) C) and D)
F) None of the above

Question 11

What is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg?

Accepted Answer

A)  12 mmHg
B)  708 mmHg
C)  720 mmHg
D)  732 mmHg
E)  760 mmHgF) B) and E)
G) A) and D)

Question 12

What volume of O2(g) at 810.mmHg pressure is required to react completely with a 4.50g sample of C(s) at 48°C? 2 C(s) + O2(g)  →\rarr→  2 CO(g)

Accepted Answer

A)  1.22 L
B)  3.47 L
C)  4.63 L
D)  9.26 L
E)  111 L F) All of the above
G) A) and C)

Question 13

A gas evolved during the fermentation of sugar was collected.After purification its volume was found to be 25.0 L at 22.5°C and 702 mmHg.How many moles of gas were collected?

Accepted Answer

A)  0.95 mol
B)  1.05 mol
C)  12.5 mol
D)  22.4 mol
E)  724 molF) B) and D)
G) C) and D)

Question 14

A sample of helium gas occupies 355mL at 23°C.If the container the He is in is expanded to 1.50 L at constant pressure, what is the final temperature for the He at this new volume?

Accepted Answer

A)  1,250 °C
B)  978 °C
C)  70.1 °C
D)  80.0 °C
E)  1,520 °CF) B) and E)
G) A) and D) B

Question 15

Give five examples (list names)of compounds that exist as gases at room temperature and pressure.

Accepted Answer

(Answers will vary.)...

Question 16

What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?

Accepted Answer

A)  0.274 g/mol
B)  3.64 g/mol
C)  78.2 g/mol
D)  137 g/mol
E)  365 g/molF) B) and E)
G) D) and E)

Question 17

What is the pressure (in atmospheres)of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 735 mmHg and h = 8.3 cm?

Accepted Answer

The answer of What is the pressure (in atmospheres)of the...

Question 18

Calculate the volume occupied by 56.5 g of argon gas at STP.

Accepted Answer

A)  22.4 L
B)  31.7 L
C)  34.6 L
D)  1,270 L
E)  1,380 LF) B) and C)
G) A) and B)

Question 19

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 1.00 L of hexane (C6H14, density = 0.660 g/mL) completely, yielding carbon dioxide and water?

Accepted Answer

A)  187 L
B)  712 L
C)  894 L
D)  1780 L
E)  8490 LF) A) and D)
G) B) and E) E

Question 20

Which of these properties is/are characteristic(s) of gases?

Accepted Answer

A)  High compressibility
B)  Relatively large distances between molecules
C)  Formation of homogeneous mixtures regardless of the nature of gases
D)  A and B.
E)  A, B, and C.F) A) and D)
G) D) and E)

Exam 5: Gases

What is the definition of a "gas"?

Correct AnswerverifiedA "gas" is a substance in whic...View AnswerShow Answer

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H2(g) at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Correct AnswerverifiedC

Calculate the molar mass of a gaseous substance if 0.125 g of the gas occupies 93.3 mL at STP.

Correct AnswerverifiedShow Answer

How many atoms of He gas are present in a 450 mL container at 35°C and 740 mmHg?

Correct AnswerverifiedShow Answer

What is standard temperature and standard pressure in units of °C and atm?

Correct Answerverified0°C and 1 ...View AnswerShow Answer

Gasoline (which can be considered to be octane, C8H18)burns in oxygen to produce carbon dioxide and water.What volume (L)of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL.1 gal = 3.78 L)

Correct AnswerverifiedShow Answer

A sample of pure nitrogen has a temperature of 15 °C.What is the temperature of the nitrogen in units of Kelvin?

Correct AnswerverifiedShow Answer

Calculate the density, in g/L, of SF6 gas at 27°C and 0.500 atm pressure.

Correct AnswerverifiedShow Answer

The following data describes an initial and final state for an ideal gas.Given that the amount of gas does not change in the process, what is the final pressure (atm)of the gas?

Correct AnswerverifiedShow Answer

Which of the following describes Dalton's Law?

Correct AnswerverifiedShow Answer

What is the pressure of the gas trapped in the apparatus shown below when the atmospheric pressure is 720 mmHg?

Correct AnswerverifiedShow Answer

What volume of O2(g) at 810.mmHg pressure is required to react completely with a 4.50g sample of C(s) at 48°C? 2 C(s) + O2(g) →\rarr→ 2 CO(g)

Correct AnswerverifiedShow Answer

A gas evolved during the fermentation of sugar was collected.After purification its volume was found to be 25.0 L at 22.5°C and 702 mmHg.How many moles of gas were collected?

Correct AnswerverifiedShow Answer

A sample of helium gas occupies 355mL at 23°C.If the container the He is in is expanded to 1.50 L at constant pressure, what is the final temperature for the He at this new volume?

Correct AnswerverifiedB

Give five examples (list names)of compounds that exist as gases at room temperature and pressure.

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

What is the molar mass of Freon-11 gas if its density is 6.13 g/L at STP?

Correct AnswerverifiedShow Answer

What is the pressure (in atmospheres)of the sample of gas trapped in the open-tube mercury manometer shown below if atmospheric pressure is 735 mmHg and h = 8.3 cm?

Correct AnswerverifiedShow Answer

Calculate the volume occupied by 56.5 g of argon gas at STP.

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 1.00 L of hexane (C6H14, density = 0.660 g/mL) completely, yielding carbon dioxide and water?

Correct AnswerverifiedE

Which of these properties is/are characteristic(s) of gases?

Correct AnswerverifiedShow Answer

Correct Answer
verified
A "gas" is a substance in whic...
View Answer

When active metals such as magnesium are immersed in acid solution, hydrogen gas is evolved.Calculate the volume of H₂(g) at 30.1°C and 0.85 atm that can be formed when 275 mL of 0.725 M HCl solution reacts with excess Mg to give hydrogen gas and aqueous magnesium chloride.

Correct Answer
verified
C

Correct Answer
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Correct Answer
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Correct Answer
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0°C and 1 ...
View Answer

Gasoline (which can be considered to be octane, C₈H₁₈)burns in oxygen to produce carbon dioxide and water.What volume (L)of oxygen at STP is necessary to react with 1.0 gal of gasoline? (The density of gasoline is 0.81 g/mL.1 gal = 3.78 L)

Correct Answer
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Correct Answer
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Calculate the density, in g/L, of SF₆ gas at 27°C and 0.500 atm pressure.

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 O₂(g) at 810.mmHg pressure is required to react completely with a 4.50g sample of C(s) at 48°C? 2 C(s) + O₂(g) $\rarr$ 2 CO(g)

Correct Answer
verified

Correct Answer
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Correct Answer
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B

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

Correct Answer
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Correct Answer
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Correct Answer
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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 1.00 L of hexane (C₆H₁₄, density = 0.660 g/mL) completely, yielding carbon dioxide and water?

Correct Answer
verified
E

Correct Answer
verified