The heat of formation of Fe2O3(s) is 826.0 kJ/mol. Calculate the heat of the reaction when a 43.20 g sample of iron is reacted.   a. 159.7 kJ b. 1.784 × 104 kJ c. 638.9 kJ d. 1278 kJ e. 319.5 kJ   thanks for your help! :)

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