2.33. Consider a binary liquid mixture for which the excess Gibbs energy is given by GE/RT=Ax1x2. What is the minimum value of A for which liquid/liquid equilibrium is possible? Figure 12.23: xy diagram for ethanol(1)/ethyl acetate(2) and for chloroform(1)/tetrahydrofuran(2), both at a constant pressure of 1 bar. Note that the curves are intentionally unlabeled, but they can be identified based on information presented in Figs. 12.19 through 12.22