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1. What is the root mean square velocity of methane (CH4) at 273oK?
1 m/s 1304 m/s 310 m/s 652 m/s 16 m/s

2. Calculate the mole fraction of gas A, which has a pressure of 110. torr, in the air, which has a pressure of 800. torr.
0.138 0.427 0.121 4.23 13.8

3. 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

4. A sample of N2 was collected over water at 20oC and a total pressure of 760 mmHg. A total volume of 0.250 L was collected. What mass of nitrogen was collected? (Vapor pressure of water is 17.5 torr)
0.101 g 0.286 g 0.598 g 0.121 g None of the above

5. 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

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