Using the equations
Ca (s) + 12 O2 (g) → CaO (s) AH° = -635 kJ/mol
CaO (s) + H₂O (1)→ Ca(OH)2 (s) AH° = -64 kJ/mol
2 H₂ (g) + O2(g) → 2 H₂O (1) AH° = -572 kJ/mol
Determine the enthalpy for the reaction
Ca (s) + 2 H₂O (1)→ Ca(OH)2 (s) + H₂ (g).