A liquid mixture of species 1 and 2 is in equilibrium with its vapor at 150 C for which y1 = 0.80. Determine the equilibrium pressure P in kPa and liquid composition x1 from the following information:

ln 1 = 2 2 , ln 2 = 1 2 ( )

At 150C, 1 = 68.76 , 2 = 53.55

The system forms an azeotrope at 150 C for which 1 = 1 = 0.4

Use modified Raoults Law