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Using Hess' Law,what Is ΔH°rxn at 25°C for the Following

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Using Hess' law,what is ΔH°rxn at 25°C for the following reaction? ClF(g) + F2(g) → ClF3(g) 2ClF(g) + O2(g) → Cl2O(g) + OF2(g) ΔH°rxn = +167.4kJ/mol
2ClF3(g) + 2O2(g) → Cl2O(g) +3OF2(g) ΔH°rxn = +341.4kJ/mol
2F2(g) + O2(g) → 2OF2(g) ΔH°rxn = -43.4 kJ/mol

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