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The standard enthalpy of forrnation of N...

The standard enthalpy of forrnation of `NH_3` is `46 kJ mol^-1`.If the enthalpy of formation of `H_2` from its atoms is `-436 kJ mol^-1` and that of nitrogen is `-712 kJ mol^1`,the average bond enthalpy of N-H bond in `NH_3` is

A

`+1056 kJ mol^-1`

B

`-1102 kJ mol^-1`

C

`-964 kJ mol^-1`

D

`+352 kJ mol^-1`

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The correct Answer is:
D
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