A proof is given of the following statement: “If a set of isomeric forms is accessible to a chemical substance at equilibrium in a closed system (at given T and P, say) then the (relative) amount of the substance present at equilibrium is greater than it would be if only a strict subset of these forms were accessible”. The proof is restricted to ideal solutions. The statement is illustrated by calculations on the system consisting of benzene and the methyl benzenes to show the implications for equilibrium conversion and yield.
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Smith et al. (1974) studied this question.
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