From Equilibrium Constants to Reaction Enthalpies

In this case, the earlier authors found a correlation between these values and the basicity (i.e. ionization energy) of the olefins. Assuming the trends in Ar//m°(16) hold for the gas 

One might have thought that complications from solvent effects would be ameliorated by considering solid state reactions of the type shown in equation 17. Such a study has been reported35. However, it is complicated by unusual stoichiometries, polymorphism and counterion effects. 

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