EXCESS-ENTHALPIES OF BINARY-MIXTURES OF SOME HYDROCARBONS

In order to understand the intermolecular interaction of aromatic hydrocarbons with other non-electrolyte solvents having molecules of different shapes and sizes, excess molar enthalpies (H(E)) of binary systems, namely, o-xylene + cyclohexane. p-xylene + cyclohexane and benzene + n-octane, have been determined at 300.05 K using an isothermal phase change calorimeter. The observed excess enthalpies have been interpreted in terms of the intermolecular interactions within the mixture. The experimental H(E) data has been compared with the corresponding values obtained from Flory's theory for binary mixtures. For the studied systems, the contact interactions contribution to H(E) is found to predominate the equation of state contribution.