The heat capacity and the heats and temperatures of fusion of 1,3,5-trimethylbenzene have been determined experimentally. This substance exhibits three melting points: at 228.424°K, at 223.346°K, and at 221.462°K. The only solid phase having reproducible heat capacities was found to be the one having the highest melting point. The entropy of the ideal gas at 25°C and one atmos pressure has been found to be 92.09±0.15 cal/deg mole.
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Taylor et al. (1955) studied this question.
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