The enthalpies of formation of SbF 5(l) and Sb 2S 3(c) and the high-temperature thermodynamic functions of Sb 2S 3(c) and Sb 2S 3(l)

Abstract

The energies of combustion of Sb(c) and Sb 2S 3(c) in fluorine were measured in a bomb calorimeter. The standard enthalpies of formation ΔH f o(298.15 K), of SbF 5(l) and Sb 2S 3(c) were derived to be −(1327.95 ± 0.93) kJ mol −1 and −(141.8 ± 4.1) kJ mol −1, respectively. High-temperature enthalpy increments were determined for crystalline and liquid Sb 2S 3 by drop calorimetry. The enthalpy and entropy of melting of Sb 2S 3(c) at 823 K were derived to be (40.64 ± 0.20) kJ mol −1 and (49.38 ± 0.24) J K −1 mol −1, respectively.