7.60 Glycerol (a) and benzyl ethyl amine (b) form two partially miscible liquid phases. At 220°Cand 1 atm, the compositions of the two phases are given by rg = 0.9

and xg0.2. From these data, estimate the parameters in the three-suffix Margules equation. At equilibrium, the fugacities in each liquid phase must be equal, that is, \hat{f}_{a}^{l, \alpha}=\hat{f}_{a}^{l, \beta} \quad \text { and } \quad \hat{f}_{b}^{l, \alpha}=\hat{f}_{b}^{l, \beta}