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When 4g of iron is burnt to ferric oxide at constant pressure 29.28 Kj of

When 4g of iron is burnt to ferric oxide at constant pressure 29.28 Kj of heat is evolved. What is the enthalpy of formation of ferric oxide? (At wt Fe=56) a)-40.99Kj b)+818.8Kj C)-81.98Kj D)-819.8kj

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