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Calculate the enthalpy of formation of SO2 (g) from the standard enthalpy changes of the following reactions:
2SO2 (g) + O2 (g) → 2SO3(g) ΔH°rxn = -196 kJ
2S (s) + 3O2 (g) → 2SO3 (g) ΔH°rxn = -790 kJ
S (s) + O2 (g) → SO2 (g) ΔH°rxn = ?
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