A binary system of species 1 and 2 consists of vapor and liquid phases in equilibrium at temperature T. The overall mole fraction of species 1 in the system is z1=0.65. At temperature T,ln1=0.67x22;ln2=0.67x12;P1sat=32.27kPa; and P2sat=73.14kPa. Assuming the validity of Eq. (13.19), (a) Over what range of pressures can this system exist as two phases at the given T and z1 ? (b) For a liquid-phase mole fraction x1=0.75, what is the pressure P and what molar fraction V of the system is vapor? (c) Show whether or not the system exhibits an azeotrope