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 calculated 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.