Thermochemistry of Inorganic Solids. 4. Enthalpies of Formation of Compounds of the Formula MX(a) Y(b)

摘要

Accurate values for the enthalpies of formation of solid compounds are of great utility for many applications such as calculating equilibrium mixture compositions in a system where solid compounds are present and in predicting the stability of the solid compounds. There are several reliable methods available for estimating enthalpies of formation of gaseous and liquid compounds, but methods for the estimation of enthalpies of formation of solid compounds to within a few kJ/mol are lacking. In a recent paper, we have presented evidence that for solid-metal oxyhalide compounds of different valence states, the standard enthalpies of formation of these compounds can be correlated quantitatively with the enthalpies of formation of the corresponding oxides and halides of the same oxidation states. We have also discovered quantitative relations that exist between the standard enthalpies of formation of various types of solid-metal compounds such as polyvalent binary compounds, hydrated compounds, etc. Reprints. (MJM)