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The standard enthalpy of formation of NH...

The standard enthalpy of formation of NH3 is -46.0 kJ `mol^(-1)`. If the enthalpy of formation of `H_2` from its atoms is -436 kJ mol and that of `N_2` is -712 kJ mol, the average bond enthalpy of N - H bond in `NH_3` is

A

`-964 kJ mol^(-1)`

B

`+352 kJ mol^(-1)`

C

` + 1056 kJ mol^(-1)`

D

`-1102 kJ mol^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
`+352 kJ mol^(-1)`
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Knowledge Check

  • Bond dissociation enthalpies of H_(2(g)) and N_(2(g)) are "426.0 kJ mol"^(-1) and "941.8 kJ mol"^(-1) , respectively, and enthalpy of formation of NH_(3(g))" is "-"46 kJ mol"^(-1) . What are the enthalpy of atomisation of NH_(3(g)) and the average bond enthalpy of N-H bond respectively ( in kJ "mol"^(-1) )?

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    1170.9, 390.3
    B
    117, 300
    C
    300, 200
    D
    2000, 1975

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