Chapter 15, Problem 15.13P

Consider a binary system of species 1 and 2 in which the liquid phase exhibits partial miscibility. In the regions of miscibility, the excess Gibbs energy at a particular temperature is expressed by the equation:

$G^E/RT=2.25x_1{x}_2$

In addition, the vapor pressures of the pure species are:

$P_1^{sat}=75kPa$ and $P_2^{sat}=110kPa$

Making the usual assumptions for low-pressure VLE, prepare a Pxy diagram for this system at the given temperature.