Aliquid mixture of benzene (a) and toluene (b) is composed of na = 2 mole of benzene (a) and no = 3 mole of toluene (b). at room temperature, the vapor pressures of pure benzene and pure toluene are pa* = 103.01 torr and pb* = 32.06 torr, respectively. (a) (4 pts.) as the pressure of the liquid solution is reduced at constant room temperature, at what pressure does the first vapor form? what is the composition of the first trace of vapor formed? (b) (4 pts.) as the pressure is reduced further at constant room temperature, at what pressure does the last trace of liquid disappear? what is the composition of the last trace of liquid? assume that the liquid phase is an ideal solution and the vapor phase is an ideal gas mixture.