Unit 9 Homework
Gases
Name: _____________________________________ Date: __________ Period: _____
Completion: ________ /50
Graded: ________ /50
Bonus: ________
Total:
________ /100
Directions:
Answer each question in the space provided. For problems with calculations, be sure
to show all work, include units, round answers to the correct number of significant figures where
appropriate, and place a box around your final answer.
1.
Perform the following conversions:
a.
2.44 atm to torr
b.
682 torr to kPa
c.
776 mm Hg to atm
2.
On Titan, the largest moon of Saturn, the atmospheric pressure is 1.63105 Pa. What is the
atmospheric pressure on Titan in atmospheres?
3.
Show the approximate level of the movable piston in drawings (a), (b), and (c) after the
indicated changes have been made to the gas.

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4.
Suppose you are given two 1-L flasks and told that one contains a gas of molar mass 30, the
other of molar mass 60, both at the same temperature. The pressure in flask A is 1.0 atm, and
the mass of the gas in the flask is 1.2 g. The pressure in flask B is 0.5 atm, the mass of the
gas in the flask is 1.2 g. Which flask contains gas of molar mass 30 and which contains gas
of molar mass 60? Explain your answer.
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5.
The Hindenburg was a hydrogen-filled dirigible that exploded in 1937. If the Hindenburg
held 2.0
×
10
5
m
3
of hydrogen gas at 23°C and 1.0 atm, what was the mass of the hydrogen in
kilograms?
6.
A scuba diver’s tank contains contains 0.29 kg of O
2
compressed into a volume of 2.3 L.
a.
Calculate the gas pressure inside the tank at 9°C.
b.
What volume would this oxygen occupy at 26°C and 0.95 atm?

7.
When filling a weather balloon with gas you have to consider that the gas will expand greatly
as it rises and the pressure decreases. Let’s say you put about 10.0 moles of He gas into a
balloon that can inflate to hold 5000.0 L. Currently, the balloon is not full because of the high
pressure on the ground. What is the pressure when the balloon rises to a point where the
temperature is -10.0°C and the balloon has completely filled with the gas?

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- Fall '19