The enthalpy changes, ΔH , for three reactions are given.
H 2 (g)+12 O 2 (g)Ca(s)+2H + (aq)CaO(s)+2H + (aq) ⟶H 2 O(l)⟶Ca 2+ (aq)+H 2 (g)⟶Ca 2+ (aq)+H 2 O(l) ΔH=−286 kJ/molΔH=−544 kJ/molΔH=−193 kJ/mol
Using Hess’s law, calculate the heat of formation for CaO(s) using the reaction shown.
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Ca(s)+12 O 2 (g)⟶CaO(s)
Answer in kJ/mol