$1.(4$ pt$)$ At $60$F$,$ Freon$-12($dichlorodifluoromethane$)$ has a vapor pressure of $72\mathrm{.}4$ psi $(1$ atm $=14\mathrm{.}7$ 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$$s equation for TCE $($based on log$10$ and $$C$)$ are: A$=6\mathrm{.}5183,$ B $=1018\mathrm{.}6$ and C $=192\mathrm{.}7.$ If a container $($negligible volume$)$ is placed in a sealed room $1000$ m$3$ 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?

$3.(4$ pt$)$ The vapor pressure of phenol $($C$6$H$5$OH$)$ is $0\mathrm{.}2$ mm Hg at $20$C$.$ It is known that phenol causes an adverse human reflex response at an air concentration of $0\mathrm{.}015$ mg$/$m$3.$ Will such a response be expected for a human in a poorly ventilated room containing open containers of phenol? Explain.

$4.(4$ pt$)$ Methanol has a vapor pressure of $92$ mm Hg at $20$C$.$ The air pollution threshold limit value is $200$ ppm$.$ Making the crude assumption that methanol forms an ideal solution with water, what concentration of methanol in water $($in mg$/$l$),$ would result in an equilibrium air concentration of $200$ ppm$?$

$5.(4$ 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$/$m$3)$ which is in equilibrium with liquid gasoline