1. (4 pt) At 60 ˚F, Freon-12 (dichlorodifluoromethane) has a vapor pressure of 72.4 psi (1 atm = 14.7 psi). If the pressure vessel containing liquid freon-12 is opened and part of its content is poured in an open beaker, how much liquid freon would remain in the beaker when equilibrium is established? Explain.

2. (4 pt) The constants for Antoine's equation for TCE (based on log10 and ˚C) are: A= 6.5183, B = 1018.6 and C = 192.7. If a container (negligible volume) is placed in a sealed room 1000 m3 at 30 ˚C, how many grams of TCE will evaporate upon reaching equilibrium with the liquid and what is the TCE concentration in the room? If the temperature in the room is lowered to 10 ˚C, how much TCE will condense and what will be the resulting air concentration?

5. (4 pt) Gasoline contains approximately 3% benzene by mass. Assuming an ideal solution, and that the benzene concentration is also 3% on a molar basis, compute the vapor concentration of benzene in air (in g/m3) which is in equilibrium with liquid gasoline.