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Calculation of bond length

Posted: Sat Nov 03, 2018 9:23 am
by Samantha Chung 4I
Is there a way that we can deduce bond length of a resonsance structure by knowing their other bond lengths? For example, in NO3, we know the bond length of N double bond O and N singe bond O?

Re: Calculation of bond length

Posted: Sat Nov 03, 2018 1:04 pm
by Elena Saab 4A
The resonance bond length is around the average of the bonds that compromise it. I don't think at our level we can know exactly the bond length.

Re: Calculation of bond length

Posted: Sat Nov 03, 2018 2:20 pm
by Ryan Troutman 4L
I believe knowing the exact bond length is outside the scope of the course, but knowing that bond length exists and how resonance is tied in with it is enough to know for the course (as of now).

Re: Calculation of bond length

Posted: Sat Nov 03, 2018 3:05 pm
by Alicia Gibbons 1B
When a molecule has a single bond and double bond that connect the same element to another element like in NO3-, in reality the double bond won't be shorter than the single bond. Instead, both bonds will have a length somewhere between the length of a double bond and a single bond. Determining this is probably beyond the scope of the course, but knowing this fact quantitatively would be useful.