General Chemistry
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Write the formation equation used for calculating the enthalpy of formation of Fe2O3(s).
Fe2(s) + 3/2 O2(g) → Fe2O3(s)
2 Fe(s) + 3/2 O2(g) → Fe2O3(s)
2 Fe(s) + 3 O(g) → Fe2O3(s)
2 Fe(s) + O3(g) → Fe2O3(s)