The heat capacity of Au 2S(cr) at low temperatures and derived thermodynamic functions

Abstract

The heat capacity of synthetic crystalline gold sulfide, Au 2S, was determined from 14 to 309 K. Fitting of the heat capacity curve yields the following values of the standard thermodynamic properties at 298.15 K and 1 bar: C p, m 0=83.54±0.15 J K −1 mol −1, Δ 0 298 S m 0=139.22±0.77 J K −1 mol −1, and Δ 0 298 H m 0=17.591±0.041 kJ mol −1.