Excess internal pressures, excess free volumes and excess thermodynamic parameters of some non-aqueous binary mixtures from ultrasonic speed, density and viscosity data

The internal pressure, πi; free volume, V f; excess internal pressure, ; excess free volume, ; excess free energy, G E; excess enthalpy, H E and excess entropy, S E of mixing for the binary mixtures of tetrahydorfuran (THF) with benzene, toluene, o-xylene, m-xylene, p-xylene and mesitylene have been calculated from experimental ultrasonic speed, density and viscosity data over the whole composition range at 298.15 K. The results have been discussed in terms of intermolecular interactions between the component molecules in the mixture. The variations of these excess functions with composition indicate that the THF-aromatic hydrocarbon interaction in these mixtures follows the order: benzene > toluene > p-xylene > m-xylene > o-xylene > mesitylene. Further, πi of these binary mixtures are also evaluated theoretically by using various equations proposed in the literature. The results are compared with the experimental findings, and relative merits of these equations in predicting internal pressure are discussed.

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