Question

Calculate the standard entropy change for the following reaction:

Ca(OH)2(s) ⟶ CaO(s) + H2O(l)

Answer 1

$ΔS^0 = S^0(CaO) + S^0(H_2O) -S^0(Ca(OH)_2) \\ = 38.2+ 69.91 -83.39 = 24.72 \; J/mol \cdot K$