Abstract
The entropies of 17 oxy‐anions have been calculated in the (hypothetical) gas state. The gas entropies for these ions have been combined with their molal entropies in aqueous solution, 0, where available, to calculate the entropies of hydration of 14 of these ions. The entropies of hydration of these ions having the formula, XOn—m, can be represented by the empirical equation ΔShyd=5+(29—4.5n)Z2.

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