February 26, 2017

Homework Help: Chemistry

Posted by Dani on Tuesday, September 17, 2013 at 9:09pm.

Although the VSEPR theory is correct in predicting that CH4 is tetrahedral, NH3 is trigonal pyramidal,
and H2O is bent, the HNH angle in NH3 is only 107.3° and the HOH angle in H2O is only 104.5°.
Explain these deviations from the expected tetrahedral angle of 109.5°.

I think it has something to do with the electron repulsion but I'm not exactly sure. I remember my professor talking about a cube.

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