Thermodynamic properties of organic oxygen compounds. Part 17.—Low-temperature heat capacity and entropy of the cresols

Abstract

Heat capacities from 12 to 400°K, heats of fusion, and triple points of pure samples of o-, m- and p-cresols have been measured by adiabatic calorimetry and used to calculate tables of thermodynamic properties. Experimental values of S°_298.15 were: o-cresol (c), 39.54; m-cresol (l), 50.81; p-cresol (c), 39.99 cal deg.^–1 mole^–1. Values for the entropies of the cresol in the ideal gas state at 298.15 and 400°K and 1 atm pressure have also been calculated from the experimental data. Transitions with small heat changes were observed in o-cresol at 222°K and in m-cresol at 95 and 257°K.