A perturbation theory for mixtures of molecules interacting through the Kihara potential is proposed. We show that the Kihara potential with the Lorentz-Berthelot combination rule to describe the crossed interaction is able to give very good results for the excess properties of different mixtures. The results obtained by using the Kihara model are comparable to or even better than those obtained with the more popular site-site model. We have applied the theory to several mixtures of hydrocarbons involving different geometries, such as methane + ethane, methane + propane, ethane + propane, methane + isobutane, ethane + isobutane, and propane + benzene. In all the cases the calculated excess properties agree very well with the experimental values. The theory can be applied to any nonpolar mixture without restriction of geometry and the calculations can be performed in a personal computer which make the theory well suited for practical applications.
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