Review for Gases
1. If 4.00 L of a gas at 1.04 atm is changed to 745 torr at constant temperature, what
is its final volume?
Ans: 4.24L
2. If 2.00 L of a gas at 0oC is changed to 1575 ml at constant pressure, what is its
final temperature?
Ans: 215 K
3. A sample of gas occupies 3.44L. What will be its new volume if its pressure is
doubled at constant temperature?
Ans: 1.72 L
4. If 4.00 L of a gas at 33o C is changed to 66o C at constant pressure, what is its
final volume?
Ans: 4.43 L
5. What is the total pressure of a gas mixture containing He at 0.25 atm, Ne at 0.55
atm and Ar at 0.30 atm?
Ans: 1.10 atm
3/9/2016
1.
P1
V1
T1
P2
V2
1.00 atm
1.00 L
273 K
2.00 atm
2.00 L
T2
Ans
1090 K
2.
7.00 atm
3.
4.
2.91 L
721 torr
200 mL
300 K
3.30 atm
6.00 L
400 K
45ºC
780 torr
2.22 L
77ºC
1.21 atm
0.850 L
100ºC
2.12 L
541 torr
68.8 K
7. A diver at the depth of 100 ft (pressure is approximately 3 atm) exhales a small bubble
of air with a volume equal to 100 mL. What will the volume of bubble be at the surface?
`
Ans: 300 mL
8. A weather balloon is filled with 0.295 m3 of He on the groundat 18 C and 756 torr.
What will the volume be at an altitude of 10 km where the temperature is -48ºC and the
pressure is 0.14 atm?
Ans: 1.6m3
9. A sample tube containing 103.6 mL of CO gas at 20.6 torr is connected to an
evacuated 1.13 L flask. What will be the pressure when CO is allowed in the flask?
Ans: 1.89 torr
10. What instruments are used to measure atmospheric pressure and gas pressure? How
do they work?
11. What are the main points of KMT? Under what condition of pressure and is a gas
most likely to obey gas laws?
3/9/2016