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1. A balloon occupies a volume of 1.0 liter when it contains 0.08 grams of hydrogen gas at STP. If hydrogen gas is added to the balloon while pressure and temp are kept constant, what will be the new volume?
0.50 L 1.0 L 2.0 L 4.0 L 5.0 L

2. A container contains 0.20 moles of O2 and 0.15 moles of H2. If the temperature of the container is 273 Kelvin, which is true?
The average molecular speeds of the two gases are the same The total masses of the two gases are the same The partial pressures of the two gases are the same The average kinetic energy of the two gases are the same The molecular masses of the two gases are the same

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. At constant temperature, pressure, and volume, which gas has the most molecules?
He H2 Cl2 F2 All of the above

5. What is the density of methane at 1.00 atm and 298oK?
0.327 g/L 0.654 g/L 1.308 g/L 4.26 g/L None of the above

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