Abstract
Semi-empirical three-parameter relations for the average intermolecular energy ū m and the excess functions of nonrandom mixtures have been derived from a hypothesis that the asymmetry of the functions result from the formation of molecular clusters. It is postulated that changes in cluster concentration upon dilution in an inert solvent can be interpreted as changes in the apparent three-body interaction parameters. Comparison with data for binary systems where there is unusual composition dependence of the excess chemical potentials demonstrates the accuracy of the relations. Conclusions regarding the sources of deviations from random mixing come from computer simulations and other data.
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