Some Thermodynamic Properties of Bromobenzene from 0 to 1500 K

Measurements were made of the heat capacity of crystalline and liquid bromobenzene from 11 to 300 K, of the triple point and heat of fusion at the triple point and of the heat of vaporization at one temperature. The adiabatic calorimeter used was precise over most of its range to ±0.l percent; the purity of the sample was 99.998 mol percent. The triple point of pure bromobenzene is 242.401 K (-30.749 °C) ±0.0l0°; the enthalpy and entropy of fusion are, respectively, 10702 ± 5 J mol^-1 and 44.150 ± 0.022 J K^-1 mol^-1. The heat and entropy of vaporization at 293.00 K are, respectively, 43 963 ±60 J mol^-1 and 150.0 ± 0.2 J K^-1 mol^-1. Tables are given for the thermodynamic functions of the condensed phases from 0 to 300 K; the functions for the ideal gas from 100 to 1500 K, calculated from spectroscopic and molecular data using statistical mechanical methods, are also tabulated. The entropy of the ideal gas at 293.00 K and one atmosphere, from statistical mechanics, is 323.63 J K^-1 mol^-1; the same quantity from the experimental measurements (third law) is 323.73 J K^-1 mol^-1. No anomalies or additional transitions were observed.