A solution is prepared containing two volatile substances, benzene $(78\mathrm{.}11$ g$/$mole$)$ and diethyl ether $(74\mathrm{.}23$ g$/$mole$).$ The vapor pressure of pure benzene is $95\mathrm{.}1$ mmHg at $298$ K$.$ The vapor pressure of pure ether is $531$ mmHg at $298$ K$.$ If $44$ grams of diethyl ether is mixed with $25$ grams of benzene, what would the total vapor pressure of the solution be$?$

An aqueous solution of a non$-$electrolyte X $($MW$=100\mathrm{.}0$ g$/$mole$)$ has a mole fraction of X of $0\mathrm{.}18,$ and a density of $1\mathrm{.}24$ g$/$ml$.$ Determine:

Osmotic Pressure at $298$ K $\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$

Freezing point $($Kf$=1\mathrm{.}86$ K$/$m$)\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_$