&$)$ The Combined Rooult$-$Dalton equilitrinm relation may be a sed to determ ine phase composition for the briany gistens benzene$-$touls benzere$-$toluene, at Low pressures and temperaterese. cal collalate the Compasition of the vapar in equilibricum, with a liquid containcing $0\mathrm{.}6$ mole fraction of benzene at $68.$ Vapour pressue of bengere is $0\mathrm{.}0986$atm & toluene is $0\mathrm{.}0297$atm.