From the enthalpies of reaction
2 H2(g) + O2(g) → 2 H2O(g) Δ = -483.6 kJ
3 O2(g) → 2 O3(g) Δ = +284.6 kJ
calculate the heat of the reaction
3 H2(g) + O3(g) → 3 H2O(g)
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