Bond lengths

[Kimberly Bauer 4E]

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]

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]

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]

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