Calorimetric properties of diphenyl ether from 0-degrees to 570-degrees-K

Abstract

The heat capacity, enthalpy, and entropy of diphenyl ether from 0° to 570° K are cal-culated from experimental heat capacities obtained. by using an ad~abatic.vacuum calorimeter and a Bunsen ice calorimeter. The heat of fU SIOn and the tnple-pOlnt temperature are given as 17,216 ± 17 absolute joules mole-I and 300.03 ± 0.01 ° K, respectively. Heat of combustion experiments in a bomb calonmeter gave the value -6,135.64 ± 0.88 absolute kilojoules mole-I for the standard heat of combustion of the liquid at 30° C. The standard heats of combustion and formation are computed for both liquid and solid at 25° C. The standard entropy and Gibbs free energy of formation for the solid at 25 °. q are given a s -590.1 ± 0.5 absolu te joules deg-I Illole-I and 143.8 ± 0.9 absolute ktlo)oules mole-I, respectively.