Abstract
The temperatures, standard enthalpies and entropies of fusion of all positional isomers of phenylenediamine, dihydroxybenzene and aminophenol were determined using microcalorimetry. Their various heat capacities were measured as a function of temperature and were compared with each other in the solid state. The increase in heat capacity on substitution of a hydrogen atom for an OH or NH 2 functional group has been determined.
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