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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 enthalpies of `A_(2), AB` and `B_(2)` are in the ratio `1:1:0.5` and the enthalpy of formation of `AB` from `A_(2)` and `B_(2)` is `-100kJ mol^(-1)` , what is the bond enthalpy of `A_(2)` ?

A

400 kJ /mol

B

200 kJ / mol

C

100 kJ/ mol

D

300 kJ / mol

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The correct Answer is:
A
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