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Calculate the bond energy of N-N bond if...

Calculate the bond energy of N-N bond if heat of atomisation of `NH_3` and `N_2H_4` are 'x' and 'y' kcal `mol^(-1)` respectively.

A

`(3y-4x)/4`

B

`(4y-3x)/3`

C

`(y-4x)/3`

D

`(3y-4x)/3`

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