Please could you help me with the following problem. I havesubmitted it three ti

Question

Please could you help me with the following problem. I havesubmitted it three times before, and havereceived three conflicting answers(b,c&d). Please would you provide me with the correct answeras well as an explanation as I have an exam coming up and need toknow how to go about answering such a type of problem. Thank-you.

Which of the following molecular oxygen ions would be expected tohave the largest bond enthalpy?

a. O2 (i.e.molecular oxygen)
b. O2 + (i.e.molecular oxygen with a +1 charge)
c. O2 2+ (i.e.molecular oxygen with a +2 charge)
d. O2 2- (i.e.molecular oxygen with a -2 charge)
e. O2 - (i.e.molecular oxygen with a -1 charge)

Explanation / Answer

Higher Bond order -> higher bond enthalpy Draw out lewis structure/use molecular orbital theory to determinebond order. Bond order: O2: 2 (double) O2 +: 1.5 O22+: 3 O22-: 1 O2-: 1.5 Overall: since O22+ has the highest bond order, it is expected tohave the largest bond enthalpy.

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