1.
Consider the flasks diagramed below. What are the final partial pressures of H
2
and N
2
after the stopcock between the two flasks is opened? (Assume the final volume is 3.00
L.)
P
H2
=
torr
P
N2
=
torr
What is the total pressure (in torr)?
torr
2.
A sealed balloon is filled with
0.80
L of helium at 23°C and 1.00 atm. The balloon rises
to a point in the atmosphere where the pressure is
180
. torr and the temperature is

29
°C. What is the change in volume of the balloon as it ascends from 1.00 atm to a
pressure of
180
. torr?
L
3.
An ideal gas is contained in a cylinder with a volume of 5.0
10
2
mL at a temperature
of 30°C and a pressure of
730
. torr. The gas is then compressed to a volume of 25 mL,
and the temperature is raised to
788
.°C. What is the new pressure of the gas?
torr
4.
A
4.0
L flask contains
0.51
g O
2
at a temperature of
29
°C. What is the pressure (in
atm) inside the flask?
atm
5.
Consider the following chemical equation.
2 NO
2
(
g
)
N
2
O
4
(
g
)
If
25.0
mL of NO
2
gas is completely converted to N
2
O
4
gas under the same conditions,
what volume will the N
2
O
4
occupy?
mL
6.
A bicycle tire is filled with air to a pressure of
72
psi, at a temperature of
27
°C. Riding
the bike on asphalt on a hot day increases the temperature of the tire to 58°C. The
volume of the tire increases by
3.5
%. What is the new pressure in the bicycle tire?
psi
7.
A hotair balloon is filled with air to a volume of
2.39
10
3
m
3
at 745 torr and
29
°C. The
air in the balloon is then heated to
65
°C, causing the balloon to expand to a volume of
5.21
10
3
m
3
. What is the ratio of the number of moles of air in the heated balloon to the
original number of moles of air in the balloon? (Hint: Openings in the balloon allow air to
flow in and out. Thus the pressure in the balloon is always the same as that of the
atmosphere.)
(moles of heated air / moles of cool air)
8.
A sample of nitrogen gas was collected over water at 20.°C and a total pressure of
1.36
atm. A total volume of
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 Spring '07
 Van Koppen
 Partial Pressure, pH, energy increase decrease, Ne torr

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