Consider a binary mixture for which the excess Gibbs energy is given by G/RT=2.6(x1)*(x2). For each of the following compositions, determine whether one or two liquid phases will be present. If two liquids phases will be present find their compositions and the amount 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