Calculate the activity coeffi cients of a binary mixture of 20.0 mol% acetone (1) in chloroform (2) at 35.17°C using the UNIQUAC activity coeffi cient model. The UNIQUAC parameters are reported as follows:

The system pressure under these conditions has been reported to be 261.9 torr and a mole fraction of acetone in the vapor of 0.143. How do your calculated activity coeffi cients compare to the experimental data?

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r q q' Acetone 2.57 2.34 2.34 Chloroform 2.7 2.34 2.34 and a12 a21 = = - 171.71 93.93