1. A sealed 4.0 L flask contains 884 mmHg of nitrogen gas at 94.0 °C. The flask is cooled until the pressure is reduced to 442 mmHg. What is the temperature of the gas?

2. The density of hydrogen gas in a rigid container is 0.117 g/L at 55 °C. What is the pressure of hydrogen in the flask if it is heated to 125 °C?

3. What is the root-mean-square velocity of carbon dioxide molecules at 55 °C?

4. Methane gas, CH4, effuses through a barrier at a rate of 0.568 mL/min. If an unknown gas effuses through the same barrier at a rate of 0.343 mL/min, what is the molar mass of the gas?

5. If 26.5 g of methanol (CH3OH) is added to 735 g of water, what is the molality of the methanol?

6. The freezing point depression constant for water is -1.86 °C/m. At what temperature will a solution containing 7.75 g KCL and 45.0 g H2O begin to freeze? Assume that no ion-pairing occurs between K+ and Cl-.

7. If 2.00 g of helium gas and 5.46 g of oxygen gas are mixed together, what is the mole fraction of helium in the solution?

8. Determine the mass percent of CaCl2 in a 4.50 M solution with a density of 1.37 g/mL

9. The average mass of a carbon atom is 12.011. Assuming you were able to pick up only one carbon atom, the chances that you would choose a carbon atom with a mass of 12.011 is:

10. How much heat is required to raise the temperature of a 4.48 g sample of iron (specific heat = 0.45 J/g °C) from 25.0 °C to 79.8 °C?