liquid mixture containing 70.0 mol of n-pentane and 30.0 mol of n-hexane initially at 46°C is partially vaporized at P = 1 atm in a single-stage distillation apparatus (Rayleigh still). The heat added to the system, Q, vaporizes liquid at the rate nv (mol/s). The vapor product and remaining liquid at a given moment are always in equilibrium with each other. The relationship between the mole fraction of pentane in the liquid (x) and that in the vapor (y) is of the form y = ax/x + b so that the sy