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CGP EDU Academic Team
Published on: August 14, 2026
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. Wt. of Fe = 56)
Text Solution
Verified by ExpertsThe correct answer is:
B
Given: Weight of iron burnt 
Heat liberated 
and atomic weight of iron 
. We know that in ferric oxide 
of iron or 
of iron are burnt. We also know that when 
of iron are burnt, then heat liberated = 29.28 kJ , therefore when 
of the iron are burnt, then heat liberated 
(Minus sign due to liberation of heat).
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