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Gas law problems
Name
You’ll need to use partial pressure, combined, or the ideal gas law equation for the following
problems. Be sure to show the set-up of your problem so if there is a problem we can figure out
what you did. Remember the chant for converting temperature.
R = 8.31 L kPa/ mol K
R = 0.821 L atm/mol K
1. A cylinder of compressed gas has a pressure of 4.882 atm on one day. The next day, the
same cylinder of gas has a pressure of 4.690 atm, and its temperature is 8 oC. What was
the temperature the previous day in oC?
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2. A student collects a sample of H2S gas over water at a temperature of 27 oC. The total
pressure of the gas that has displaced a volume of 15 mL of water is 207.33 kPa. What is
the pressure of the H2S collected? ( be sure to use the partial pressure handout).
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3. A 2.2 L sample of hydrogen at 6.5 atm is used to fill a balloon at a final pressure of 1.15
atm. What is its final volume?
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4. A sample of argon has a volume of 0.43 L at 24 oC. At what temperature in oC will it have
a volume of 0.57 mL.
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5. A large balloon contains 11.7 g helium. What volume will the helium occupy at an
altitude of 10,000 m, where the atmospheric pressure is 0.262 atm and the temperature
is -50 oC.
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6. A student collects 425 mL of oxygen at a temperature of 24 oC and a pressure of 0.89
atm. How many moles of oxygen did the student collect?
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7. What pressure, in atm, is exerted by 0.325 mol of hydrogen gas in a 4.08 L container at
35 oC?
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8. A student collects 450 mL of HCl gas at a pressure of 100 kPa and a temperature of 17
oC. What is the volume of the HCl at 0 oC and 101.3 kPa?
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