CaO can be used as a drying agent. One such application occurs when water is added to dry concrete or cement. The reaction that occurs is CaO(s) + H20(1) = Ca(OH)2 (s) The product is commonly called slaked lime. Assuming the commonly used standard-state temperature of 25 °C, calculate ASuniv for this reaction using data from the table below. ΔΗΡ [J/(K-mol)]| (kJ/mol) S° Substance CaO(s) 39.9 -635.1 H2O(1) 69.9 -285.8 Ca(OH)2 (s) 83.4 -986.1

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