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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: lilmul123 on November 21, 2006, 08:53:12 PM

Title: Need help with VSEPR model
Post by: lilmul123 on November 21, 2006, 08:53:12 PM

I need help creating the VSEPR model for the following compound: F3S-SF  (I'm assuming S2F4).

First, I need to find the molecular structure(s). (linear, tetrahedral, etc etc.) Then I need to find the hybridization(s) and the bond angle(s). 

What I thought it was was trigonal bipyramidal (s connected to another S and three F's) and linear (one S connected to one F) and can't figure out why i'm wrong.  There seems to be a lone pair on an S, so maybe that's what's screwing me up, but I'm generally not sure. 

I've gotten it wrong four times on webassign, and one more time wrong will lose points on the question.  So I came here again! thank you in advance.

Title: Re: Need help with VSEPR model
Post by: Yggdrasil on November 22, 2006, 02:32:06 AM

You have to take into account the fact that each sulfur has lone pairs on it.  Try counting the number of electrons around each sulfur to get a better idea of how many bonds and lone pairs each sulfur has.

Title: Re: Need help with VSEPR model
Post by: AWK on November 22, 2006, 04:45:59 AM

We have 1 electron pair at S(F3) and 2 pairs at S(F)