Bond length (hw problem 3.85, part B)

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Steven Garcia 1H
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Bond length (hw problem 3.85, part B)

Postby Steven Garcia 1H » Thu Nov 29, 2018 7:44 pm

For this problem, wouldn't the SO3 molecule have a shorter bond length than SO2? The solution manual shows that they are approximately the same. Both the molecules only have double bonds but the SO2 molecule has a lone pair on its central S atom. Wouldn't the lone pair weaken the S-O bond in SO2 (thus its bond length would be larger relative to the bond length of SO3)?

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Re: Bond length (hw problem 3.85, part B)

Postby Chem_Mod » Thu Nov 29, 2018 10:16 pm

The lone pair distorts the bond angle because it repels the bonds away from itself. This decreases the bond angle, but it doesn't necessarily change the bond lengths.

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