Abstract

It is shown that in terms of the number N of elements in solid interoxide polymeric compounds and minerals, the molar heat capacity ratio C /N is a p single function of temperature. The molar heat capacity of a solid polymeric compound is found to be equal to the sum of the molar heat capacities of its constituent solid oxides at all temperatures. The standard entropies of formation of the alkali and alkaline earth polymeric compounds per atom of oxygen are both-95±5 J [atom O]- 1 K-1, which is similar to all other inorganic compounds. The standard free energies and enthalpies of formation of polymeric interoxide compounds at a given temperature T are directly proportional to the number N of elements in the compound.

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