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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. 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 oxygen sample contains volume of 6.00 L at 25oC and 900. torr. How many molecules does this sample contain?
0.291 0.502 2.46*10^23 1.75*10^23 6.02*10^23

4. 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

5. 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

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