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 compositions and the a mount of each phase present (phase fractions).

(a) z1 = 0.2

(b) z1 = 0.3

(c) z1 = 0.5

(d) z1 = 0.7

(e) z1 = 0.8