Abstract
The excess volumes and enthalpies of mixing of binary mixtures of 1,2-dibromoethane with benzene, toluene, o-xylene, m-xylene and p-xylene have been measured experimentally over the whole composition range at 298.15 K. Qualitatively, the data have been explained on the basis of electron donor/acceptor interactions between 1,2-dibromoethane and the aromatic hydrocarbons and also on the basis of the loss of favourable orientational order of the pure components. The Flory theory is not able to correctly predict the V E and H E values of the studied systems. However, the Sanchez and Lacombe theory correctly predicts the change of sign of the H E values with change of mole fraction. H E calculated by this theory is of the same order as the experimental H E The calculated values for V E are in poor agreement with the corresponding experimental values for V E.
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