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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`?

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