Mathematical model of heat capacity of condensed substances using average molar volumes of elements

Abstract

The mathematical dependence of the isobaric heat capacity on the average molar volumes of chemical compounds and the number of atoms in the formula unit for the condensed state in the widest possible temperature range is obtained. It is established that, in contrast to entropy, the influence of the size of the compound (number of atoms of the formula unit) is less than the influence of the average molar volume. It is shown that the proposed mathematical model allows calculating the entropy of a compound with an average accuracy of 8 J/(mol К).