= Example 13.1 For the system methanol(1)/methyl acetate(2), the following equations provide a rea- sonable correlation for the activity coefficients: I In Y1 = Ax? In y2 = Ax? where A= 2.771 - 0.00523T In addition, the following Antoine equations provide vapor pressures: 3643.31 2665.54 In pat = 16.59158 - In Psat = 14.25326 T - 33.424 T-53.424 where T is in kelvins and the vapor pressures are in kPa. Assuming the validity of Eq. (13.19), calculate: (a) P and {yi) for T = 318.15 K and x1 = 0.25. (b) P and (xi) for T = 318.15 K and y1 = 0.60. (c) T and {yi} for P = 101.33 kPa and X1 = 0.85. (d) T and (xi) for P= 101.33 kPa and y1 = 0.40. - (e) The azeotropic pressure and the azeotropic composition for T = 318.15 K