Test Questions & Answers Chapter 16 Oxidation and Reduction

Student name:__________

MULTIPLE CHOICE - Choose the one alternative that best completes the statement or answers the question.
1) Which figure best represents the concept of pressure? (A sphere represents a gaseous atom.)

A)

B)

C)

D)

E)

2) Which of the following is not a gas at room temperature and pressure?

A) NH ₃
B) CO ₂
C) I ₂
D) CH ₄
E) H ₂

3) Which is not a property of a gas?

A) The density of a gaseous substance varies strongly with temperature.
B) A sample of gas assumes the shape and volume of its container.
C) Gases are highly compressible.
D) The densities of gases are much larger than those of corresponding liquids.
E) Gases form homogeneous mixtures with one another in any proportion.

4) Which of the following is/are characteristic(s) of gases?

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.

5) Which represents the definition of pressure?

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

6) A sample of hydrogen gas exerts a pressure of 466 torr in a container. What is this pressure in atmospheres? (1 atm = 1.01325 ×105 Pa = 760 torr)

A) 0.217 atm
B) 0.466 atm
C) 0.613 atm
D) 1.63 atm
E) 4.60 atm

7) The pressure of hydrogen sulfide gas in a container is 3.565 ×104 Pa. What is this pressure in torr? (1 atm = 101,325 Pa = 760 torr)?

A) 46.91 torr
B) 267.4 torr
C) 351.8 torr
D) 3612 torr
E) 2.709 ×10⁴ torr

8) The pressure of sulfur dioxide in a container is 159 kPa. What is this pressure in atmospheres? (1 atm = 101,325 Pa = 760 torr)?

A) 0.209 atm
B) 0.637 atm
C) 1.57 atm
D) 21.2 atm
E) 1.59 ×10⁴ atm

9) 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)?

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

10) If the atmospheric pressure in Denver is 0.8800 atm, what is this pressure expressed in mmHg? (1 atm = 101,325 Pa = 760 torr, 1 torr = 1 mmHg)?

A) 151.5 mmHg
B) 1.16 × 10⁻³ mmHg
C) 863.6 mmHg
D) 8.92 × 10⁴ mmHg
E) 668.8 mmHg

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

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

12) "The volume of an ideal gas is directly proportional to its absolute temperature at constant pressure and number of moles" is a statement of ________________ law.

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

13) "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.

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

14) What are the conditions of STP?

A) 0 K and 1 atm
B) 273.15 K and 760 torr
C) 0°C and 760 atm
D) 273.15°C and 760 torr
E) 0°C and 1 torr

15) 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?

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

16) A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature?

A) 22.3 L
B) 31.2 L
C) 44.9 L
D) 112 L
E) 380 L

17) A sample of carbon dioxide gas at 125°C and 248 torr occupies a volume of 275 L. What will the gas pressure be if the volume is increased to 321 L at 125°C?

A) 212 torr
B) 289 torr
C) 356 torr
D) 441 torr
E) 359 torr

18) A sample of gas occupies 24.5 L at a pressure of 1.57 atm. What is the pressure if the volume is increased to 48.3 L at constant temperature?

A) 0.796 atm
B) 1.26 atm
C) 3.10 atm
D) 5.38 × 10⁻⁴ atm
E) 1.86 × 10³ atm

19) 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?

A) 2.8 L
B) 2.10 L
C) 1.40 L
D) 1.05 L
E) 0.700 L

20) 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?

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

21) If 25.5 L of oxygen are cooled from 150°C to 50°C at constant pressure, what is the new volume of oxygen?

A) 0.0514 L
B) 19.5 L
C) 33.4 L
D) 0.03 L
E) 3.5 L

22) A sample of N2 gas occupies 2.40 L at 20°C. At what temperature will the N2 gas occupy a volume of 4.80 L at constant pressure?

A) 10°C
B) 40°C
C) 146°C
D) 313°C
E) 586°C

23) 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?

A) 0.186 L
B) 0.251 L
C) 0.383 L
D) 0.410 L
E) 0.517 L

24) A gas sample occupies 8.76 L at a temperature of 37°C. What is the volume if the temperature is lowered to 0°C at constant pressure?

A) 9.95 L
B) 0 L
C) 4.22 L
D) 74.1 L
E) 7.71 L

25) What is the final temperature of a gas that expands from a volume of 22.4 L at 278 K to a volume of 38.3 L?

A) 163 K
B) 294 K
C) 3.09 K
D) 217 K
E) 475 K

26) If 2.3 mol of a gas occupies 50.5 mL, how many moles of the gas will occupy 85.5 mL at the same temperature and pressure?

A) 1.4 mol
B) 0.59 mol
C) 3.9 mol
D) 0.26 mol
E) 2.3 mol

27) If 2.38 mol of a gas has a volume of 120.0 mL, what is the volume of 1.97 mol of the gas at the same temperature and pressure?

A) 25.6 mL
B) 99.3 mL
C) 119 mL
D) 145 mL
E) 563 mL

28) 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?

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

29) What is the formula that describes the relationship between the pressure, volume, temperature, and moles?

A)
B)
C)
D)
E)

30) A fixed quantity of gas has a pressure of 1.35 atm, a volume of 23.8 L, and a temperature of 205.1 K. If the pressure increases to 2.84 atm and the temperature rises to 233.4 K, what is the new volume of the gas?

A) 0.183 L
B) 7.06 L
C) 9.94 L
D) 12.9 L
E) 57.0 L

31) 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?

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

32) 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?

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

33)

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

34) 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)

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

35)

A) 2.1 × 10⁻²³ molecules
B) 4.9 × 10²² molecules
C) 3.1 × 10²³ molecules
D) 3.6 × 10²⁵ molecules
E) 0.081 molecules

36)

A) 0.0186 L
B) 4.5 L
C) 11.2 L
D) 49.2 L
E) 53.7 L

37) What is the volume occupied by 25.2 g of CO₂ at 0.840 atm and 25°C? (R = 0.08206 L • atm/K • mol)

A) 0.060 L
B) 1.34 L
C) 16.7 L
D) 24.2 L
E) 734 L

38) What is the volume occupied by 2.11 x 10 ²³ molecules of methane gas (CH ₄) at 25°C and 1.0 atm? ( R = 0.08206 L • atm/K • mol)

A) 22.4 L
B) 8.57 L
C) 50.5 L
D) 7.19 L
E) 13.9 L

39) What is the volume occupied by 4.78 x 10 ²³ molecules of SO ₂ gas at 35°C and 1.5 atm? ( R = 0.08206 L • atm/K • mol)

A) 74.8 L
B) 80.5 L
C) 13.4 L
D) 15.2 L
E) 21.4 L

40)

A) 0.263 g
B) 2.46 g
C) 3.80 g
D) 35.2 g
E) 206 g

41)

A) 0.272 mol
B) 2.27 mol
C) 3.69 mol
D) 206 mol
E) 227 mol

42)

A) 9.00 × 10⁻² atm
B) 0.933 atm
C) 1.11 atm
D) 1.70 atm
E) 11.1 atm

43)

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

44) A 250.0-mL sample of ammonia, NH3(g), exerts a pressure of 833 torr at 42.4°C. What mass of ammonia is in the container? (R = 0.08206 L • atm/K • mol, 1 atm = 760 torr)

A) 0.0787 g
B) 0.180 g
C) 8.04 g
D) 17.0 g
E) 59.8 g

45)

A) 172 mmHg
B) 107 mmHg
C) 0.225 mmHg
D) 0.172 mmHg
E) 14.4 mmHg

46)

A) 1.44 g/L
B) 134 g/L
C) 44.0 g/L
D) 53.6 g/L
E) 14.4 g/L

47)

A) 3.38 × 10⁻³ g/L
B) 2.97 g/L
C) 22.4 g/L
D) 32.9 g/L
E) 3.38 kg/L

48)

A) 1.52 g/L
B) 1.65 g/L
C) −39.3 g/L
D) 40.0 g/L
E) 1.25 kg/L

49)

A) 0.0176 g/L
B) 0.0250 g/L
C) 0.0561 g/L
D) 1.78 g/L
E) 181 g/L

50) 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)

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

51)

A) 187 g/mol
B) 121 g/mol
C) 112 g/mol
D) 31.6 g/mol
E) 8.28 × 10⁻³ g/mol

52) Determine the molar mass of Freon-11 gas if a sample weighing 0.597 g occupies 100 cm3 at 95°C and 1000 mmHg (R = 0.08206 L • atm/K • mol, 1 atm = 760 mmHg).

A) 0.19 g/mol
B) 35.3 g/mol
C) 70.9 g/mol
D) 137 g/mol
E) 384 g/mol

53)

A) 7.76 g/mol
B) 66.1 g/mol
C) 73.9 g/mol
D) 81.4 g/mol
E) 144 g/mol

54)

A) CH ₂
B) C₂H₄
C) C₃H₆
D) C₄H₈
E) C₆H₁₂

55)

A) NO
B) NO ₂
C) N₃O₆
D) N₂O₄
E) N₂O₅

56) A 7.75-L flask contains 0.482 g of hydrogen gas and 4.98 g of oxygen gas at 65°C. What is the partial pressure of oxygen in the flask?

A) 0.557 atm
B) 0.043 atm
C) 1.11 atm
D) 33.5 atm
E) 67 atm

57) Determine the partial pressure of helium in a gas mixture composed of 10.0 grams of CO₂ and 10.0 grams of helium. The mixture is at 75ºC in a 12.0-liter container.

A) 5.95 atm
B) 1.28 atm
C) 0.541 atm
D) 0.117 atm
E) 7.23 atm

58) Determine the partial pressure of CO₂ in a gas mixture composed of 782.4 grams of CO₂ and 2.10 moles of CO. The mixture is at 703.3 K in a 25.8-liter container.

A) 4.70 atm
B) 44.5 atm
C) 39.8 atm
D) 22.4 atm
E) 17.8 atm

59) Determine the partial pressure of N₂ in a gas mixture composed of 1.0 mol of N₂ and 1.5 mol of Ar. The mixture is at 0.0ºC in a 10.0-liter container.

A) 3.36 atm
B) 0.00 atm
C) 5.60 atm
D) 6.12 atm
E) 2.24 atm

60) Determine the mole fraction of N₂ in a gas mixture composed of 1.0 mol of N₂ and 1.5 mol of Ar. The mixture is at 0.0ºC in a 10.0-liter container.

A) 0.40
B) 0.60
C) 1.0
D) 1.5
E) 2.5

61) Determine the mole fraction of CO in a gas mixture composed of 782.4 grams of CO₂ and 2.10 moles of CO. The mixture is at 703.3 K in a 25.8-liter container.

A) 0.11
B) 0.89
C) 17.8
D) 0.48
E) 0.52

62) Determine the mole fraction of CO₂ in a gas mixture composed of 10.0 grams of CO₂ and 10.0 grams of helium. The mixture is at 75ºC in a 12.0-liter container.

A) 0.92
B) 2.7
C) 0.23
D) 0.080
E) 0.77