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JEE Main Chemistry question

ChemistryThermodynamicsJEE Main

The standard enthalpy of formation of is . If the enthalpy of formation of from its atoms is and that of is , the average bond enthalpy of the N-H bond in is **[AIEEE 2010]**

Answer: (B)

Solution

Using bond-energy terms with and (positive dissociation energies): H_f$ =

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Question ID VK-134763