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I have a question about bond lengths. On the past midterm, one of the questions asked us to find the bond lengths in a molecule given two other bond lengths. Are we always supposed to average out the other two bond lengths in such a scenario or is there an important concept I am missing?
yes, in this question you were suppose to take the average of the bond lengths. This is because of resonance and how electrons are delocalized and double and single bonds are just used as visual representations for Lewis structures.
You always take the average and add it to the bond lengths, because double or single bonds in resonance structures are equally shared among the compound. So for a molecule with a triple bond and two single bonds, the average bond length would be 1 and 1/3.
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