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AB, A(2) and B(2) are diatomic molecules...

`AB, A_(2)` and `B_(2)` are diatomic molecules.If the bond enthalpy of `A_(2,)` AB from `A_(2)` and `B_(2)` od `-100 kJ//"mol"`, what is the bond enthalpy of `A_(2)" in" kJ//mol`.` ?

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