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Question

AB,A2 and B2 are diatomic molecules. If the bond enthalpies of A2,AB and B2 are in the ratio 1:1:0.5 and enthalpy of formation of AB from A2 and B2 is 100 kJ mol1. What is the bond energy of A2?

A
200 kJ mol1
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B
100 kJ mol1
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C
300 kJ mol1
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D
400 kJ mol1
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