atmospheric pressure, ethyl acetate and ethyl alcohol form an azeotrope containing $53\mathrm{.}9\%($mol$)$ acetate boiling at $345$ K$.$ Determine: $($a$)$ The van Laar constants $($b$)$ The azeotropic composition and the total pressure if the mixture forms an azeotrope boiling at $329\mathrm{.}5$ K $($c$)$ The composition of the vapour in equilibrium with a liquid of composition $60\%($mol$)$ alcohol and boiling at $329\mathrm{.}5$ K Vapour pressure, kPa at $345$ K at $329\mathrm{.}5$ K Ethyl alcohol $78\mathrm{.}2439\mathrm{.}72$ Ethyl acetate $84\mathrm{.}7747\mathrm{.}98$