The excess Gibbs energy for the system chloroform (1) / ethanol (2) at 55°C is well represented by the Margules equation, written:
GE / RT = (1.42x1 + 0.59 x2)x1x2 The vapor pressures of chloroform and ethanol at 55°C are:
P1sat = 82.37 kPa
P2sat = 37.31 kPa
(a) Assuming the validity of Eq. (10.5), make BUBL P calculations at 55°C for liquid- phase mole fractions of 0.25, 0.50, and 0.75.
(b) For comparison, repeat the calculations using Eqs. (14.1) and (J4.2) with virial coefficients:
B11 = -963 cm3 mol-1
B22 = -1,523 cm3 mol-1
B12 = 52 cm3 mol