Posted by Casey on Sunday, November 8, 2009 at 3:23pm.
1. You know what makes a dipole.
2. You review to see which has two dipoles.
Symmetry is a big clue in this. CO2 are linear molecules, CH4 is a symmetrical (tetrahedral) molecule, and NH3 is not symmetrical, with a double unshared pair of electrons on one side.
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