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AB, A2 and B2 are diatomic molecules. If...

AB, `A_2` and `B_2` are diatomic molecules. If the bond enthalpies `A_2 AB` and `B_2` are in the ratio 1:1:0.5 and the enthalpy of formation of AB fron `A_2` and `B_2` is -100 kJ `mol^-1`, what is the bond enthalpy of `A_2`:

A

200 kJ `mol^-1`

B

200 kJ `mol^-1`

C

100 kJ `mol^-1`

D

300 kJ `mol^-1`

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The correct Answer is:
A
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