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[" Q.65When "4" g of iron is burnt to fe...

[" Q.65When "4" g of iron is burnt to ferric oxide at constant "],[" pressure,"29.28kJ" of heat is evolved.What is the enthalpy "],[" of formation of ferric oxide (At.Wt.of Fe "=56)],[[" (A) "-81.98kJ," (B) "-819.8kJ],[" (C) "-40.99kJ," (D) "+819.8kJ]]

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