Bond lengths

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Kimberly Bauer 4E
Posts: 51
Joined: Thu Jul 25, 2019 12:17 am

Bond lengths

Postby Kimberly Bauer 4E » Sun Oct 27, 2019 9:54 pm

In my lecture notes, I have that N-O bond length in N03- =1.24 Angstroms and a C-C bond length is 1.39 Angstroms. Is this a standard measurement for all bonds between these elements?

Sidharth D 1E
Posts: 98
Joined: Sat Aug 24, 2019 12:17 am

Re: Bond lengths

Postby Sidharth D 1E » Sun Oct 27, 2019 9:57 pm

In class, he gave us those as the experimentally found values for the bond lengths, so those are the values for those bonds in specifically those molecules.

Sarah Nichols 4C
Posts: 52
Joined: Sat Aug 24, 2019 12:18 am

Re: Bond lengths

Postby Sarah Nichols 4C » Sun Oct 27, 2019 10:10 pm

These values are experimentally measured bond lengths of an N--O bond in NO3- and a C--C bond in C6H6 specifically. These are important because they show that real-life models of molecules with resonance structures are not any one of these possible structures at a time, but actually an average of all of them. Take NO3-, for example: the experimentally measured length of an N--O single bond is 1.40 angstrom, and the length of an N--O double bond is 1.20 angstrom. The fact that all of the N--O bonds in a nitrate ion are experimentally measured as 1.24 angstrom shows that the multiple bond character is spread over the entire molecule, rather than one of the bonds at a time being double bond.

Elizabeth Johnson 1I
Posts: 53
Joined: Wed Sep 11, 2019 12:16 am

Re: Bond lengths

Postby Elizabeth Johnson 1I » Sun Oct 27, 2019 10:16 pm

are we expected to know the bond lengths or is it safe to assume they will be given if needed?

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