b$.$ Methanol $(1)$ and acetone $(2)$ form an azeotrope at $760$ Torr with $x_1=0\mathrm{.}2,T=$

$55\mathrm{.}70C.$ Evaluate the parameters in the van Laar equation. Estimate the liquid

composition and the pressure if the liquid phase is in equilibrium with a vapor

composed of $75$mol$\%$ acetone at $25C.$ You may assume that the vapor phase is

ideal.

c$.$ You have an ideal ternary system composed of acetone $(1),$ acetonitrile $(2),$ and

nitromethane $(3).$ Calculate the pressure and vapor phase composition when $T=$

$80C$ and $x_{?}=\{x_1=0\mathrm{.}3,x_2=0\mathrm{.}3\}.$ Also calculate the pressure and liquid phase

composition when $T=70C$ and $y_{?}=\{y_1=0\mathrm{.}5,y_2=0\mathrm{.}3\}.$