Answer:
The average bond enthalpy for the N-H bond is 392 kJ/mol.
Explanation:
..[1]
..[2]
..[3]
On adding [1] , [2] and [3] , we get:



There three bonds N-H bond sin ammonia. Then average bond enthalpy of single N-H bond is :

The average bond enthalpy for the N-H bond is 392 kJ/mol.
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Answer:
A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.