Thermodynamic Properties of the Aqueous Ba2+ Ion and the Key Compounds of Barium

摘要: Recommended thermochemical property values, Δf H°, Δf G° and S° for the aqueous ion of barium, Ba2+, are given at 298.15 K in SI units. The values are: Δf H°=534.64±1.80 kJ⋅mol−1, Δf G°=−557.60±1.81 kJ⋅mol−1 S°=8.80±0.50 J⋅K−1 mol−1. They consistent with CODATA Key Values Thermodynamics. evaluation involves analysis enthalpy changes, Gibbs energy entropy measurements all key substances network. A set is BaO(cr), BaH2(cr), BaCl2(cr), BaCl2⋅2H2O(cr), Ba(NO3)2(cr), BaCO3(cr,witherite), as well reconstituted recommended process uncertainties reactions involving these substances.