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Multiple Choice Quiz
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1
On a day when atmospheric pressure is 75.83 cmHg, a pressure gauge on a tank of gas reads a pressure of 258.5 cmHg. What is the absolute pressure (in atmospheres and kPa) of the gas in the tank?
A)334.3 cm Hg = 4.399 atm = 445.7 kPa
B)182.7 cmHg = 2.40 atm = 243.2 kPa
C)334.3 cmHg = 4.398 atm = 445.6 kPa
D)258.5 cmHg = 3.40 atm = 345 kPa
2
A certain mass of an ideal gas occupies a volume of 4.00 m3 at 758 mmHg. Compute its volume at 635 mmHg if the temperature remains unchanged.
A)3.55 m3
B)0.298 m3
C)1.19 m3
D)4.77 m3
3
A given mass of ideal gas occupies 38 mL at 20°C. If its pressure is held constant, what volume does it occupy at a temperature of 45°C?
A)86 mL
B)35 mL
C)17 mL
D)41 mL
4
A tank of ideal gas is sealed off at 20°C and 1.00 atm pressure. What will be the pressure (in kPa and mmHg) in the tank if the gas temperature is decreased to -35°C?
A)125 kPa = 9.35 x 102 mmHg
B)82 kPa = 1.08 mmHg
C)1.75 kPa = 13 mmHg
D)82 kPa = 6.2 x 102 mmHg
5
Given 1000mL of helium at 15°C and 763 mmHg, determine its volume at -6°C and 420 mmHg.
A)1.68 x 103 mL
B)7.27 x 102 mL
C)1.97 x 103 mL
D)5.08 x 102 mL
6
A 5000-cm3 tank contains an ideal gas (M=40 kg/kmol) at a gauge pressure of 530 kPa and a temperature of 25°C. Assuming atmospheric pressure to be 100 kPa, what mass of gas is in the tank?
A)0.051 kg
B)0.61 kg
C)51 kg
D)5.1 x 104 kg
7
An air bubble of volume V0 is released near the bottom of a lake at a depth of 11.0 m. What will be its new volume at the surface? Assume its temperature to be 4.0°C at the release point and 12°C at the surface. The water has a density of 1000 kg/m3, and atmospheric pressure is 75 cmHg.
A)1.1 Vo
B)2.1 Vo
C)2.0 Vo
D)6.2 Vo
8
Find the mass of a neon atom. The atomic mass of neon is 20.2 kg/kmol.
A)3.36 kg
B)3.36 x 10-23 kg
C)3.36 x 10-26 kg
D)2.98 x 10-27 kg
9
At what temperature will the molecules of an ideal gas have twice the rms speed they have at 20°C?
A)586 K = 313°C (approximately)
B)1172 K = 899°C (approximately)
C)414 K = 141°C (approximately)
D)73 K = -200°C (approximately)
10
An object must have a speed of at least 11.2 km/s to escape from the Earth's gravitational field. At what temperature will urms for H2 molecules equal the escape speed? Repeat for N2 molecules. (MH2=2.0 kg/kmol and MN2=28 kg/kmol.)
A)1.0 x 104 K; 1.4 x 105 K
B)5.0 x 103 K; 7.0 x 104 K
C)1.0 x 107 K; 1.4 x 108 K
D)3.0 x 104 K; 4.2 x 106 K







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