| Popis: |
The heat capacity of dicesium monoxide, Cs2O, was measured by adiabatic calorimetry from 5 to 350 K. The thermodynamic results at 298.15 K were as follows: C p o (298.15 K ) = (76.00 ± 0.23) J K −1 mol −1 ; S o (298.15 K ) = (146.87 ± 0.44) J K −1 mol −1 ; {H o (298.15 K ) − H o (0)} = (17678 ± 53) J mol −1 ; {G o (298.15 K ) − H o (0)} 298.15 K = − (87.58 ± 0.29) J K −1 mol −1 . The standard Gibbs energy of formation, ΔGfo, of Cs2O was derived from experimental results to be ΔGfo(Cs2O, c, 298.15 K) = − (308.42 ± 1.18) kJ mol−1. To permit practical thermodynamic calculations to be made at higher temperatures, the heat capacities were extrapolated to 763 K, the melting temperature of Cs2O, and a table of extrapolated thermodynamic functions, including ΔGfo(T) up to T = 763 K, is presented. |
