When 4g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat

When 4g of iron is burnt to ferric oxide at constant pressure, 29.28 kJ of heat is evolved. What is the enthalphy of formation of ferric oxide? (At. Wt of Fe=56)

Options

(a) -40.99 kJ
(b) -81.98 kJ
(c) 819.8 kJ
(d) -819.8 kJ

Correct Answer:

-819.8 kJ

Explanation:

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