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CHEM 215
Section 5/6/7
Practice Problems – Gas Laws (KEY)
October 31, 2006
1.
An automobile tire when properly inflated has a pressure of 35.0 psi and a volume of 5.00 L at room
temperature (25
o
C).
What will the pressure of the tire be after a long period of driving if the volume
has increased by 0.5 L and the temperature of the air in the tire rises to 33.1
o
C?
P=2.22 atm
2.
Calculate the molar mass for a gas that has a density of 0.964 g/L at 730 torr of pressure and 95
o
C.
M
=303.2 g mol
1
3.
A mixture of 1.00g of H
2
and 1.00 g He exerts a pressure of 0.531 atm at 5.0
o
C.
What is the volume
of the container and the respective partial pressure of each gas?
V=32.1 L; P(H
2
)=0.353 atm; P(He)=0.178 atm
4.
Oxygen gas can be generated by the decomposition of mercuric oxide (shown below).
What volume
of oxygen gas, measured at 27
o
C and 745 torr, can be produced by the complete decomposition of
3.72 g of mercuric oxide?
2
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 Fall '08
 ThomasKim

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