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MHT CET Chemistry question

ChemistryThermodynamicsMHT CET

When 4 g 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. Mass of Fe = 56) [AIIMS 1999]

Answer: (B)

Solution

4 g Fe = 1/14 mol gives 29.28 kJ, so 1 mol Fe gives kJ; needs 2 mol Fe, so $Δ_fH =

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Question ID VK-064590