Apply the van Laar equation to calculate the activity coefficients in a solution of

components A and B containing $15\%($mol$)$ of A$.$ Given that the components

form an azeotropic mixture at $345$ K and $101\mathrm{.}3$ kPa with $45\%($mol$)$ of A$.$ At $345$

K the vapour pressures of A and B are $71\mathrm{.}2$ and $73\mathrm{.}8$ kPa respectively