Contribution of each structure?

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MKearney_4G
Posts: 50
Joined: Fri Aug 30, 2019 12:18 am

Contribution of each structure?

Postby MKearney_4G » Sun Nov 10, 2019 6:43 pm

Some resonance structures are really unstable and some are more stable. Is there a way to indicate the contribution of each RS to the molecule?

zachary_nhem_4I
Posts: 57
Joined: Sat Aug 17, 2019 12:18 am

Re: Contribution of each structure?

Postby zachary_nhem_4I » Sun Nov 10, 2019 7:23 pm

Wouldn't you just look at formal charges?

lilymayek_1E
Posts: 107
Joined: Sat Aug 17, 2019 12:16 am

Re: Contribution of each structure?

Postby lilymayek_1E » Sun Nov 10, 2019 11:12 pm

formal charge indicates stability (0 is best unless there is a distinct negative/positive charge on the molecule) but I don't think there's a particular way we need to know to find the contribution of each resonance structure? just understand that all structures contribute to an overall average (which is the most stable) I think.

VPatankar_2L
Posts: 104
Joined: Thu Jul 25, 2019 12:17 am
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Re: Contribution of each structure?

Postby VPatankar_2L » Fri Nov 15, 2019 3:03 pm

I think that if you draw a Lewis Structure for the molecule, you will see that the atom that forms a double or triple bond with the central atom is contributing more electrons than the atom that is forming a single bond with the central atom.

Junxi Feng 3B
Posts: 52
Joined: Sat Sep 14, 2019 12:17 am

Re: Contribution of each structure?

Postby Junxi Feng 3B » Fri Nov 15, 2019 3:09 pm

To see which resonance structure is more stable, just look their formal charges, the one closest to 0 will be the most stable. I am not sure what do you mean by which RS contributes more to the molecule, because the resonance structure is just the moving of electrons between different atoms of a molecule.


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