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Find average bond enthalpy of N------H bond in ammonia

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Find average bond enthalpy of N------H bond in ammonia

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The correct answer is b

Bond dissociation enthalpy - It is the average of enthalpy required to dissociate the said bond present in the different gaseous compounds into free atoms in a gaseous state.

Now, 

N2 + Bond energy → 2N

For the reaction,

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