UNIT 6 - GAS LAWSQUESTION BANK

A) 1.0 liter of C2H6(g) B) 2.0 liters of O2(g)C) 5.0 liters of N2(g) D) 6.0 liters of CO2(g)

1. At STP, which gas sample has the same number ofmolecules as 2.0 liters of CH4(g) at STP?

A) 6.0 L of F2 (g) B) 4.5 L of N2 (g)C) 3.0 L of H2 (g) D) 1.5 L of Cl2 (g)

2. At STP, which gaseous sample has the same numberof molecules as 3.0 liters of N2 (g)?

A) 1.5 L of NH3(g) B) 2.0 L of CO2(g)C) 3.0 L of CH4(g) D) 6.0 L of N2(g)

3. At STP, which sample contains the same number ofmolecules as 3.0 liters of H2(g)?

A) 1.0-L cylinder of O2(g)B) 2.0-L cylinder of CH4(g)C) 1.5-L cylinder of NH3(g)D) 4.0-L cylinder of He(g)

4. Which rigid cylinder contains the same number of gasmolecules at STP as a 2.0-liter rigid cylindercontaining H2(g) at STP?

A) 1 L of CO(g) and 0.5 L of N2(g)B) 2 L of CO(g) and 0.5 L of NH3(g)C) 1 L of H2(g) and 2 L of Cl2(g)D) 2 L of H2(g) and 2 L of Cl2(g)

5. Which two samples of gas at STP contain the sametotal number of molecules?

A) A and B B) A and CC) B and C D) B and D

6. The table below shows data for the temperature,pressure, and volume of four gas samples.

Which two gas samples have the same total number ofmolecules?

A) A and B B) A and CC) B and C D) C and D

7. The table below shows mass and volume data for foursamples of substances at 298 K and 1 atmosphere.

Which two samples could consist of the samesubstance?

A) CH4 and CO2 B) CH4 and NeC) He and CO2 D) He and Ne

8. The data table below gives the temperature andpressure of four different gas samples, each in a2-liter container.

Which two gas samples contain the same total numberof particles?

UNIT 6 - GAS LAWS

A) Container X contains more gas molecules thancontainer Z.

B) Container X contains fewer gas molecules thancontainer Z.

C) Containers X and Z both contain the samenumber of gas molecules.

D) Containers X and Z both contain the same massof gas.

9. A sample of oxygen gas is sealed in container X. Asample of hydrogen gas is sealed in container Z. Bothsamples have the same volume, temperature, andpressure. Which statement is true?

A) equal masses and the same number ofmolecules

B) different masses and a different number ofmolecules

C) equal volumes and the same number ofmolecules

D) different volumes and a different number ofmolecules

10. At the same temperature and pressure, 1.0 liter ofCO(g) and 1.0 liter of CO2(g) have

A) 1.0 mole B) 1.5 molesC) 3.0 moles D) 0.0 moles

11. A closed container holds 3.0 moles of CO2 gas atSTP. What is the total number of moles of Ne(g) thatcan be placed in a container of the same size at STP?

A) densityB) massC) number of moleculesD) number of atoms

12. Each stoppered flask below contains 2 liters of a gasat STP.

Each gas sample has the same

A) atoms, onlyB) molecules, onlyC) atoms and molecules

13. The diagrams below represent four 500-milliliterflasks. Each flask contains the gas represented by itssymbol. All gas samples are at STP.

Each flask contains the same number of

A) 40 ml B) 5 mlC) 10 ml D) 80 ml

14. The pressure on 20 milliliters of a gas at constanttemperature is changed from 4 atmospheres to 2atmospheres. The new volume of the gas is

A) 40 ml B) 5 mlC) 10 ml D) 80 ml

15. The pressure on 20 milliliters of a gas at constanttemperature is changed from 4 atmospheres to 2atmospheres. The new volume of the gas is

16. A sample of gas has a volume of 2.0 liters at apressure of 1.0 atmosphere. When the volumeincreases to 4.0 liters, at constant temperature, thepressure will be

17. A sample of gas has a volume of 12 liters at 0°C and380 torr. What will be its volume when the pressureis changed to 760 torr at constant temperature?

18. If the pressure on 36.0 milliliters of a gas at STP ischanged to a pressure of 25.3 kPa at constanttemperature, the new volume of the gas is

19. A sample of a gas has a volume of 40. milliliters at76.0 kPA. What will be the new volume of the gas ifthe pressure is increased to 80.0 kPa, temperatureremaining constant?

20. The pressure on a 200-milliliter sample of CO2(g) atconstant temperature is increased from 60 kPa to120 kPa. What is the new volume of the gas?

UNIT 6 - GAS LAWS

A) 0.233 L B) 1.96 LC) 4.29 L D) 6.26 L

21. A rigid cylinder with a movable piston contains asample of hydrogen gas. At 330. K, this sample has apressure of 150. kPa and a volume of 3.50 L. Whatis the volume of this sample at STP?

A) 35.0 mL B) 52.5 mLC) 70.0 mL D) 105 mL

22. A rigid cylinder with a movable piston contains asample of gas. At 300. K, this sample has a pressureof 240. kilopascals and a volume of 70.0 milliliters.What is the volume of this sample when thetemperature is changed to 150. K and the pressure ischanged to 160. kilopascals?

A) 51.1 kPa B) 216 kPaC) 243 kPa D) 274 kPa

23. A 220.0-mL sample of helium gas is in a cylinderwith a movable piston at 105 kPa and 275 K. Thepiston is pushed in until the sample has a volume of95.0 mL. The new temperature of the gas is 310. K.What is the new pressure of the sample?

A) 1 atm and 101.3 KB) 1 kPa and 273 KC) 101.3 kPa and 0°CD) 101.3 atm and 273°C

24. Which set of values represents standard pressure andstandard temperature?

A) 69 kPa B) 93 kPaC) 160 kPa D) 230 kPa

25. At 25ºC, gas in a rigid cylinder with a movablepiston has a volume of 145 mL and a pressure of 125kPa. Then the gas is compressed to a volume of 80.mL. What is the new pressure of the gas if thetemperature is held at 25ºC?

A) from 400. K to 200. KB) from 200. K to 400. KC) from 400.°C to 200.°CD) from 200.°C to 400.°C

26. Which temperature change would cause a sample ofan ideal gas to double in volume while the pressureis held constant?

A) 9.0 L B) 6.2 L C) 5.8 L D) 4.0 L

27. A cylinder with a movable piston contains a sampleof gas having a volume of 6.0 liters at 293 K and1.0 atmosphere. What is the volume of the sampleafter the gas is heated to 303 K, while the pressure isheld at 1.0 atmosphere?

A) 400. K to 200. K B) 200. K to 400. KC) 400.°C to 200.°C D) 200.°C to 400.°C

28. A sample of gas confined in a cylinder with amovable piston is kept at constant pressure. Thevolume of the gas doubles when the temperature ofthe gas is changed from

A) 1.0 atm B) 0.50 atmC) 0.67 atm D) 1.5 atm

29. A rigid cylinder contains a sample of gas at STP.What is the pressure of this gas after the sample isheated to 410 K?

UNIT 6 - GAS LAWS

A)

B)

C)

D)

30. Which graph represents the relationship betweenpressure and volume for a sample of an ideal gas atconstant temperature?

A) 41 mL B) 49 mLC) 51 mL D) 55 mL

31. A sample of gas occupies a volume of 50.0milliliters in a cylinder with a movable piston. Thepressure of the sample is 0.90 atmosphere and thetemperature is 298 K. What is the volume of thesample at STP?

A) 2.5 L B) 2.0 LC) 1.6 L D) 0.22 L

32. A rigid cylinder with a movable piston contains a2.0-liter sample of neon gas at STP. What is thevolume of this sample when its temperature isincreased to 30.°C while its pressure is decreased to90. kilopascals?

A) decrease and the volume of the gas sample todecrease

B) decrease and the volume of the gas sample toincrease

C) increase and the volume of the gas sample todecrease

D) increase and the volume of the gas sample toincrease

33. A sample of gas is held at constant pressure.Increasing the kelvin temperature of this gas samplecauses the average kinetic energy of its molecules to

A) 0.177 atm B) 4.43 atmC) 5.64 atm D) 14.1 atm

34. A sample of helium gas has a volume of 900.milliliters and a pressure of 2.50 atm at 298 K. Whatis the new pressure when the temperature is changedto 336 K and the volume is decreased to 450.milliliters?

A) 31.5 K B) 292 KC) 566 K D) 2360 K

35. A gas occupies a volume of 444 mL at 273 K and79.0 kPa. What is the final kelvin temperature whenthe volume of the gas is changed to 1880 mL and thepressure is changed to 38.7 kPa?

A) B)

C) D)

36. Which graph best represents the pressure-volumerelationship for an ideal gas at constant temperature?

UNIT 6 - GAS LAWS

A) B)C) D)

37. The volume of a gas is 4.00 liters at 293 K andconstant pressure. For the volume of the gas tobecome 3.00 liters, the Kelvin temperature must beequal to

A) B)

C) D)

38. A gas occupies a volume of 40.0 milliliters at 20°C.If the volume is increased to 80.0 milliliters atconstant pressure, the resulting temperature will beequal to

A) B)

C) D)

39. Which graph shows the pressure-temperaturerelationship expected for an ideal gas?

A) 144 K B) 288 KC) 432 K D) 576 K

40. A 3.00-liter sample of gas is at 288 K and 1.00 atm.If the pressure of the gas is increased to 2.00 atmand its volume is decreased to 1.50 liters, the Kelvintemperature of the sample will be

A) from 200ºC to 400ºCB) from 400ºC to 200ºCC) from 200 K to 400 KD) from 400 K to 200 K

41. Which temperature change would cause the volumeof a sample of an ideal gas to double when thepressure of the sample remains the same?

A) decreases B) increasesC) remains the same

42. As the temperature of a gas increases at constantpressure, the volume of the gas

A)

B)

C)

D)

43. Which graph best shows the relationship between thepressure of a gas and its average kinetic energy atconstant volume?

A) 1.4 L B) 2.0 L C) 2.8 L D) 4.0 L

44. The temperature of a 2.0-liter sample of helium gasat STP is increased to 27°C and the pressure isdecreased to 80. kPa What is the new volume of thehelium sample?

A) decreases B) increasesC) remains the same

45. As the temperature of a given sample of a gasdecreases at constant pressure, the volume of the gas

UNIT 6 - GAS LAWS

A) 100 mL B) 300 mLC) 400 mL D) 600 mL

46. The pressure on a 200-milliliter sample of CO2(g) atconstant temperature is increased from 60 kPa to120 kPa. What is the new volume of the gas?

A) 0°C and 1.00 kPaB) 0°C and 101.3 kPaC) 273°C and 1.00 kPaD) 273°C and 101.3 kPa

47. Standard temperature and pressure are

A) 350 mL B) 750 mLC) 1,400 mL D) 5,600 mL

48. A gas has a volume of 1,400 milliliters at atemperature of 20. K and a pressure of 1.0 atm.What will be the new volume when the temperatureis changed to 40. K and the pressure is changed to0.50 atm?

A) 0°C and 51.6 kPaB) 32°C and 51.6 kPaC) 0°C and 101.3 kPaD) 32°C and 101.3 kPa

49. Standard temperature and a pressure of 0.5atmosphere are equal to

A) decreases B) increasesC) remains the same

50. A cylinder with a tightly fitted piston is shown in thediagram below.

As the piston moves downward, the number ofmolecules of air in the cylinder

A) decreases B) increasesC) remains the same

51. As the volume of a fixed mass of a gas increases atconstant temperature, the pressure of the gas

A) 120 L B) 20. LC) 30. L D) 40. L

52. If 60. liters of hydrogen gas at 546 K is cooled to273 K at constant pressure, the new volume of thegas will be

A) increase by B) increase by C) decrease by D) decrease by

53. As the temperature of a gas is increased from 0°C to10°C at constant pressure, the volume of the gas will

A) 149 K B) 298 KC) 447 K D) 596 K

54. A gas occupies a volume of 500. milliliters at apressure of 38.0 kPa and a temperature of 298 K. Atwhat temperature will the gas occupy a volume of250. milliliters and have a pressure of 76.0 kPa?

A) 1.25 L B) 2.5 LC) 5.0 L D) 10. L

55. A 2.5 liter sample of gas is at STP. When thetemperature is raised to 273ºC and the pressureremains constant, the new volume of the gas will be

A) The pressure is doubled and the temperatureis halved.

B) The pressure is halved and the temperature isdoubled.

C) Both the pressure and the temperature aredoubled.

D) Both the pressure and the temperature arehalved.

56. Which changes in pressure and temperature occur asa given mass of gas at 50.6 kPa and 546 K ischanged to STP?

A) 0 K B) 100. KC) 273 K D) 546 K

57. The volume of a sample of a gas at 273ºC is 200.liters. If the volume is decreased to 100. liters atconstant pressure, what will be the new temperatureof the gas?

A) 150. ml B) 450. mlC) 300. ml D) 600. ml

58. What volume will a 300.-milliliter sample of a gas atSTP occupy when the pressure is doubled at constanttemperature?

UNIT 6 - GAS LAWS

A) B)

C) D)

59. Which graph best shows the change in the volume of1 mole of nitrogen gas as pressure increases andtemperature remains constant?

A) 100 ml B) 200 mlC) 300 ml D) 400 ml

60. A sample of oxygen gas in a closed system has avolume of 200 milliliters at 600 K. If the pressure isheld constant and the temperature is lowered to 300K, the new volume of the gas will be

A) 1.00 atm B) 2.00 atmC) 0.250 atm D) 0.500 atm

61. A gas sample has a volume of 25.0 milliliters at apressure of 1.00 atmosphere. If the volume increasesto 50.0 milliliters and the temperature remainsconstant, the new pressure will be

A) 0.0 kPa B) 51.3 kPaC) 101.3 kPa D) 223 kPa

62. What is the difference in pressure between a gas at 50.0 kPa and a gas at standard pressure?

A) 75.0 ml B) 150. mlC) 300. ml D) 600. ml

63. A sample of oxygen gas has a volume of 150. milliliters at 300 K. If the pressure of thesample is held constant and the temperature is raisedto 600 K, the new volume of the sample will be

A) decreases B) increasesC) remains the same

64. As the temperature of a gas increases with thevolume remaining constant, the pressure of the gas

A) 100 K B) 188 KC) 273 K D) 546 K

65. At a temperature of 273 K, a 400.-milliliter gassample has a pressure of 760. millimeters ofmercury. If the pressure is changed to 380.millimeters of mercury, at which temperature willthis gas sample have a volume of 551 milliliters?

A) pressure decreases and the temperaturedecreases

B) pressure decreases and the temperatureincreases

C) pressure increases and the temperaturedecreases

D) pressure increases and the temperatureincreases

66. The volume of a 1.00-mole sample of an ideal gaswill decrease when the

A) B)

C) D)

67. Which graph represents the relationship betweenvolume and Kelvin temperature for an ideal gas atconstant pressure?

A) 5 ml B) 10 mlC) 40 ml D) 80 ml

68. The pressure on 20 milliliters of a gas at constanttemperature is changed from 4 atmospheres to 2atmospheres. The new volume of the gas is

A) 9.00 ml B) 126 mlC) 144 ml D) 226 ml

69. If the pressure on 36.0 milliliters of a gas at STP ischanged to a pressure of 25.3 kPa at constanttemperature, the new volume of the gas is

UNIT 6 - GAS LAWS

A) 0.25 L B) 2.0 LC) 0.50 L D) 4.0 L

70. The volume of a sample of a gas is 1.0 liter at STP. Ifthe pressure remains constant and the temperature israised to 546 K, the new volume of the gas will be

A) 18.0 L B) 2.00 LC) 3.00 L D) 12.0 L

71. A sample of a gas occupies 6.00 liters at atemperature of 200. K. If the pressure remainsconstant and the temperature is raised to 600. K, thevolume of the gas sample would be

A) decreases B) increasesC) remains the same

72. As the temperature of a sample of a gas increases atconstant pressure, the volume of the gas sample

A) remain the same B) increase 2 timesC) decrease by half D) increase 4 times

73. If the Kelvin temperature of a gas sample is doubledwhile the pressure is halved, the volume of the gaswill

A) directly with the Kelvin temperatureB) indirectly with the Kelvin temperatureC) directly with the mass of the gasD) indirectly with the mass of the gas

74. At a constant pressure, how does the volume of 1mole of an ideal gas vary?

A) decreases B) increasesC) remains the same

75. A sample of a gas is at STP. As the pressuredecreases and the temperature increases, the volumeof the gas

A) 0 K B) 273 KC) 100 K D) 546 K

76. The volume of a sample of a gas at 0°C is 100 liters.If the volume of the gas is increased to 200 liters atconstant pressure, what is the new temperature of thegas in degrees Kelvin?

A) 1.0 atm B) 2.0 atmC) 3.0 atm D) 4.0 atm

77. A sample of hydrogen gas at 2.0 atmospheres and273 K occupies a volume of 5.0 liters. The gassample is completely transferred to a 10.0-litersealed, rigid container. What is the new pressure ofthe gas sample when the temperature returns to 273K?

A) 5.60 L B) 22.4 LC) 11.2 L D) 44.8 L

78. If the pressure and Kelvin temperature of 2.00 molesof an ideal gas at STP are doubled, the resultingvolume will be

A) 1.0 atm B) 2.0 atmC) 0.50 atm D) 0.25 atm

79. A sample of gas has a volume of 2.0 liters at apressure of 1.0 atmosphere. When the volumeincreases to 4.0 liters, at constant temperature, thepressure will be

A) 150. K B) 200. KC) 300. K D) 600. K

80. At constant pressure, what temperature must bereached to increase a 100.-milliliter sample of a gasinitially at 300. K to a volume of 200. milliliters?

A) 263 K B) 283 KC) 273 K D) 293 K

81. At constant pressure, the volume of a gas willincrease when its temperature is changed from 10ºCto

A) 12.5 ml B) 50.0 mlC) 100. ml D) 200. ml

82. A gas has a pressure of 120 kPa, a temperature of400. K, and a volume of 50.0 milliliters. Whatvolume will the gas have at a pressure of 60 kPa anda temperature of 200. K?

A) 5.49 L B) 45.0 LC) 55.5 L D) 455 L

83. A rigid cylinder with a movable piston contains 50.0liters of a gas at with a pressure of 1.00atmosphere. What is the volume of the gas in thecylinder at STP?

UNIT 6 - GAS LAWS

A) less often and with less forceB) less often and with more forceC) more often and with less forceD) more often and with more force

84. When a sample of gas is cooled in a sealed, rigidcontainer, the pressure the gas exerts on the walls ofthe container will decrease because the gas particleshit the walls of the container

A) decreases B) increasesC) remains the same

85. A 100.-milliliter sample of helium gas is placed in asealed container of fixed volume. As the temperatureof the confined gas increases from 10.ºC to 30.ºC,the internal pressure

A) decreases B) increasesC) remains the same

86. As the pressure on a given sample of a gas increasesat constant temperature, the mass of the sample

A) decreases B) increasesC) remains the same

87. As the pressure on a sample of a gas increases atconstant temperature, the volume of the gas

A) decreased by a factor of 2B) increased by a factor of 2C) decreased by a factor of 200.D) increased by a factor of 200.

88. When a sample of a gas is heated in a sealed, rigidcontainer from 200. K to 400. K, the pressureexerted by the gas is

89. Base your answer to the following question on the information below and on your knowledge ofchemistry.

The enclosed cabin of a submarine has a volume of 2.4 × 105 liters, a temperature of 312 K,and a pressure of 116 kPa. As people in the cabin breathe, carbon dioxide gas, CO2(g), can buildup to unsafe levels. Air in the cabin becomes unsafe to breathe when the mass of CO2(g) in thiscabin exceeds 2156 grams.

Show a numerical setup for calculating the pressure in the submarine cabin if the cabintemperature changes to 293 K.

UNIT 6 - GAS LAWS

Base your answers to questions 90 through 93 on the information below and on your knowledge ofchemistry.

A 200.-milliliter sample of CO2(g) is placed in a sealed, rigid cylinder with a movable piston at296 K and 101.3 kPa.

90. Compare the mass of the original 200.-milliliter sample of CO2(g) to the mass of the CO2(g) samplewhen the cylinder is adjusted to a volume of 100. milliliters.

91. State, in terms of both the frequency and force of collisions, what would result from decreasing thetemperature of the original sample of CO2(g), at constant volume.

92. Determine the volume of the sample of CO2(g) if the temperature and pressure are changed to 336 Kand 152.0 kPa.

93. State a change in temperature and a change in pressure of the CO2(g) that would cause it to behavemore like an ideal gas.

94. Base your answer to the following question on the following information. In a laboratory, a glass tube is filled with hydrogen gas at a very low pressure. When a scientistapplies a high voltage between metal electrodes in the tube, light is emitted. The scientist analyzesthe light with a spectroscope and observes four distinct spectral lines. The table below gives thecolor, frequency, and energy for each of the four spectral lines. The unit for frequency is hertz,Hz.

Identify one condition not mentioned in the passage, under which hydrogen gas behaves most like anideal gas.

Answer KeyGAS LAWS BANK

1. B2. C3. C4. B5. D6. B7. B8. B9. C10. C11. C12. C13. B14. A15. A16. 0.50 atm17. 6.0 L18. 144 ml19. 38 ml20. 100 mL21. C22. B23. D24. C25. D26. B27. B28. B29. D30. D31. A32. A33. D34. C35. C

36. D37. A38. C39. A40. B41. C42. B43. B44. C45. A46. A47. B48. D49. A50. C51. A52. C53. B54. B55. C56. A57. C58. A59. D60. A61. D62. B63. C64. B65. B66. C67. C68. C69. C70. B

71. A72. B73. D74. A75. B76. D77. A78. D79. C80. D81. D82. B83. B84. A85. B86. C87. A88. B89.

90. — The mass staysthe same.— Mass remainsconstant.

91. — The frequencyand force ofcollisions wouldboth decrease.— There would befewer collisions, andthe collisions wouldnot be as hard.

92. Any value from— 151 mL - 151.4mL

93. — Temperature:increase, Pressure:decrease— Temperature:higher, Pressure:lower— Temperature: anytemperature above296 K, Pressure: anypressure lower than101.3 kPa

94. High temperature