CALORIMETRIC MEASUREMENT OF PARTIAL MOLAR EXCESS-ENTHALPIES AT INFINITE DILUTION

An asymmetric isothermal flow calorimeter was used to obtain excess enthalpies of binary liquid mixtures of nonelectrolytes in the dilute region, and these data were used to calculate partial molar excess enthalpies at infinite dilution. A variety of solutes and solvents were examined to characterize the wide range of intermolecular interactions that may occur in solution. Comparisons were made to the values of the partial molar excess enthalpy at infinite dilution obtained from the temperature dependence of limiting activity coefficient data and to heats of solution at infinite dilution.