Abstract
A first-order perturbation theory based on the hard-sphere mixture as reference has been applied to describe the equilibrium properties of simple binary fluid mixtures. The intermolecular forces are assumed to be a sum of pair and triplet interactions represented, respectively, by the Maitland-Smith-Kihara (MSK) pair potential and the leading nonadditive dispersion Axilrod-Teller term. The quantum corrections are also included. The adequacies of three sets of combining rules are examined. The theory is used to compute (1) the total thermodynamic properties of Ar+Kr and Ne+Ar, (2) the excess properties of Ar+Kr, Ar+Xe, Kr+Xe and Ar+CH 4, and (3) Henry's constants of solute Ne in solvents Kr and Ar and of He in CH 4 and Ar. Comparison of theoretical predictions with experimental data indicates that the perturbation theory performs reliably, when used with the Kohler-Smith-Kong (KSK) combining rule.
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