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Bond Angles in 7E 2E.13.b

Posted: Sun Nov 18, 2018 10:28 pm
by Jonathan Omens 1K
In this problem, the POCl3 molecule has a tetrahedral shape. In class we learned that tetrahedral molecules always have bond angles of 109.5o and this is the correct answer in the solutions manual. However, the bond angles are not exactly 109.5 because (I assume) of the double bond that the oxygen has with the phosphorous. Because of this, should we put that the bond angles are about 109.5 or just put exactly 109.5?

Re: Bond Angles in 7E 2E.13.b

Posted: Sun Nov 18, 2018 10:44 pm
by 305008749
The solutions manual says 109.5 so I'm assuming the double bond doesn't affect it?

Re: Bond Angles in 7E 2E.13.b

Posted: Sun Nov 18, 2018 11:45 pm
by Tessa Lawler 1A
The solution manual says 109.5, so that’s probably your safest bet. I think that double bonds don’t affect bond angles as much as, say, lone pairs do.

Re: Bond Angles in 7E 2E.13.b

Posted: Mon Nov 19, 2018 11:40 am
by Anand Narayan 1G
Double bonds don't have nearly the same effect on bond angles that lone pairs do. Double bonds and single bonds both are the same electron density thus it doesn't affect the bond angle

Re: Bond Angles in 7E 2E.13.b

Posted: Mon Nov 19, 2018 11:57 am
by Ibrahim Malik 1H
Double bonds are almost negligible when finding bond angles, because we look at electron density in VSEPR, so double bonds and single bonds have the same value when calculating bond angles.