12.35. Consider a binary mixture for which the excess Gibbs energy is given by GE/RT = 2.6x1x2. For each of the following overall compositions, determine whether one or two liquid phases will be present. If two liquid phases will be present, find their composi- tions and the amount of each phase present (phase fractions). (a) z = 0.2 (b) z = 0.3 = 0.5 (c) Z = (d) z = 0.7 (e) z = 0.8