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1. What is the density of hydrogen gas at 800. torr and 25oC?
0.0861 1.03 4.06 2.02 None of the above

2. An ideal gas fills a balloon at 1 atm and 67oC. By what factor will the volume of the balloon change if the balloon is heated to 339oC?
9/5 5.9 1/4 4/1 3/4

3. What is the rate of effusion between He and Br2?
Br2 is 40x faster than He He is 40x faster than Br2 He is 20x faster than Br2 Br2 is 20x faster than He

4. Which gas is the most abundant in the Earth's atmosphere?
N2 O2 He H2 CO2

5. A gaseous mixture at a constant temperature contains O2, CO2, andHe. Which of the following lists the 3 gases in order of decreasing average molecular speed?
He, CO2, O2 CO2, He, O2 O2, CO2, He CO2, O2, He He, O2, CO2

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