Abstract
Measurements are reported of the excess second virial coefficients ϵ = B 12 − (B 11 + B 22) 2 for acetone + chloroform, + 1-hydroperfluoroheptane, and chloroform + triethylamine in which there is intermolecular hydrogen bonding. Acetone + perfluorohexane and benzene + cyclohexane have also been studied. Each mixture was studied at 308, 323, 348, and 373 K; acetone + chloroform was also investigated at 298 K. Values of B 12 have been calculated by combining our results with literature values of the virial coefficients of the pure components. Derived enthalpies of mixing for acetone + chloroform and benzene +cyclohexane in the gas phase are in good agreement with direct measurements. Equilibrium constants and the standard enthalpy change ΔH ⊖ for the formation of an acetone + chloroform complex have been calculated. The ΔH ⊖ for a chloroform + triethylamine complex has also been obtained.
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