A two-component mixture of toluene and benzene exhibits the boiling point diagram shown. What is the mole fraction of toluene and benzene in a vapor in equilibrium with a liquid mixture containing 0.7 toluene and 0.3 benzene in mole fraction? What is the molar composition of the liquid in equilibrium with a boiling vapor that has a composition of 50% benzene and 50% toluene?