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1. 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

2. A 5.0 L flask contains 0.50 grams of Fl2 at 27oC. What is the pressure in the flask?
1 atm 0.0058 atm 0.065 atm 2.46 atm 4.0 atm

3. 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

4. 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

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

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