Abstract
AbstractThe standard entropies of solid elements and inorganic compounds have been related to atomic or molar volumes after grouping the substances according to the periodic classification, compound type and crystal structure. It is shown that, within each sub‐group, standard entropy and molar volume are related by the expression S = aVn. For elements and simple compounds, the entropy increase between 298° K and the melting point is related parabolically to the respective temperature rise. The entropy increase for complex compounds is less than that for simple compounds and is also dependent on type of compound. Entropy of fusion is related to temperature in the same manner. It is indicated that the entropy of formation of solid products from solid reactants is directly proportional to the volume change during the reaction.
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