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Mg + 1/2.O₂ ⇒ MgO ΔH = c/2 [setelah persamaan reaksi dikali 1/2]
H₂O ⇒ H₂ + 1/2.O₂ ΔH = - b [persamaan reaksi dibalik]
___________________ +
Mg + H₂O ⇒ MgO + H₂ ΔH = a
terdapat hubungan: c/2 + (- b) = a
lalu diolah, dikali dua
diperoleh sesuai pilihan jawaban yakni 2a = c - 2b