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