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The bond dissociation energies of XY,X2 ...

The bond dissociation energies of XY,`X_2 and Y_2` (all diatomic molecules) are in the reaction 1:1:0:5 and `Delta H_r`for the formation of XY is `-200 KJ mol^(-1)` what will be the bond dissociation energy of `X_2`?

A

`400 kJ mol^-1`

B

`300 kJ mol^-1`

C

`200 kJ mol^-1`

D

`800 kJ mol^-1`

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The correct Answer is:
D
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