The excess Gibbs free energy for the liquid mixture chloroform(1)/ethanol(2) at 330 K is well represented by the Margules equation, written: GE RT = X1X2(1.42x1 +0.59x2) Accordingly, the activity coefficients are given by: Y1 = exp[x(0.59 + 1.65x)] Y2 = exp[x{(1.42 - 1.65x2)] The vapor pressures of chloroform and ethanol at 330 K are 88.04 kPa and 40.75 kPa, respectively = (a) It is known that this binary system forms an azeotrope at 330 K. Determine the pressure and composition of the azeotrope, assuming that vapor phase is an ideal gas mixture. (b) Repeat your calculation in Part (a), if the vapor phase is not ideal but instead can be described by a virial equation of state generalized to binary mixtures, whereby the fugacity coefficients are given by: [BuP+ P(1 - y.)2812 0.(T, P, y) = exp RT 21.6.2 ]