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A2+B2 rarr 2AB. delta Hf^0= -200 kj mol^...

`A_2+B_2 rarr 2AB. delta H_f^0= -200 kj mol^(-1)`
`AB,A_2 and B_2` are diatomic molecules .If the bond enthalpies of `A_2,B_2` and AB are in the ratio `1:0.5:1` , then the bond enthalpy of `A_2` is ___kj `mol^-1`(Nearest integer)

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