I need this asap please. What is the dimensionless excess Gibbs free energy $(\frac{G^E}{R}T)$ for the binary liquid mixture that is

in equilibrium with vapor at $1\mathrm{.}4$ bar at the following conditions: $x_1=0\mathrm{.}40,y_1=0\mathrm{.}55,P_1$ sat $=\frac{2\mathrm{.}0}{b}ar,$

$P_2^{\text{s}\text{a}\text{t}}=1\mathrm{.}4$ bar.