Partial molar isobaric heat capacities of a substance in a system containing a chemical equilibrium. A basis for the estimation of the effect of solvent reorganisation on heat capacities of activation for chemical reaction

Abstract

The partial molar enthalpy and partial molar isobaric heat capacity of a substance Z is considered for a system containing a chemical equilibrium between substances X and Y. An equation for the isobaric heat capacity of Z identifies two contributions. The first describes the heat capacity of Z when the chemical reaction between X and Y is frozen whereas the second describes a contribution from a change in composition to preserve chemical equilibrium between X and Y. The treatment offers a method for quantifying the effects of solvent reorganisation on the heat capacities of activation for chemical reaction.