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H₂O(g) ⇒ H₂(g) + 1/2.O₂(g) ΔH = + 57,8 kkal (reaksi II yang dibalik)
H₂O(l) ⇒ H₂O(s) ΔH = - 1,4 kkal (reaksi III tetap)
H₂(g) + 1/2.O₂(g) ⇒ H₂O(l) ΔH = - 68,3 kkal (reaksi I dibalik)
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H₂O(g) ⇒ H₂O(s) ΔH = - 11,9 kkal