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1. At constant temperature, pressure, and volume, which molecule has the highest average velocity?
H2 F2 He Br2 All of the above

2. At 298oK, 800. torr, and 250. mL of gas has a mass of 4.62 grams. What is its molecular weight?
300 46 3.21 0.0107 429

3. In a certain container, you have 0.2 moles O2 and 0.3 moles N2. What is the partial pressure of the oxygen at STP?
0.2 atm 0.3 atm 0.4 atm 0.5 atm 0.6 atm

4. A mixture of gases contains 48 g O2, 84 grams N2, 9.0 grams of water vapor. If the total pressure is 700 mmHg, what is the partial pressure of the nitrogen gas?
0.092 atm 0.28 atm 0.37 atm 0.46 atm 0.55 atm

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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