A Study of the Calcium Oxide–Water Vapor System by Means of the Transpiration Method

Abstract

Abstract The system of calcium oxide and water vapor was studied using the transpiration method. Under the conditions of a temperature range from 1678 to 2016 K and PH2O values from 1.2×10−2 to 4.7×10−1 atm, the predominant reaction in this system was found to be CaO(s)+H2O(g)=Ca(OH)2(g). The standard Gibbs free energy of the reaction is given by this equation: ΔGr°=(61300±820)−(12.8±0.48)T (cal/mol) in the present temperature range. From the thermochemical cycle, the dissociation energy, D0°(Ca–(OH)2), was estimated to be 206.4 kcal/mol.