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Question

Given that H2(g)+F2(g)⟶2HF(g) Δ𝐻∘rxn=−546.6 kJ 2H2(g)+O2(g)⟶2H2O(l) Δ𝐻∘rxn=−571.6 kJ calculate the value of Δ𝐻∘rxn for 2F2(g)+2H2O(l)⟶4HF(g)+O2(g)