(a) Determine the composition of the liquid in equilibrium with a vapor containing $70 \mathrm{~mol} \%$ benzene, $30 \mathrm{~mol} \%$ toluene if the system exists in a vessel under a pressure of $2 \mathrm{~atm}$. Predict the equilibrium temperature.

(b) Determine the composition of the vapor in equilibrium with liquid containing $70 \mathrm{~mol} \%$ benzene, $30 \mathrm{~mol} \%$ toluene if the system exists in a vessel under a pressure of $2 \mathrm{~atm}$. Predict the equilibrium temperature.