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I believe that within a molecule, you draw dipoles for each bond. When looking at the bond, you compare the two elements' electronegativity. Parallel to the bond, draw an arrow that points towards the element that is more electronegative. .
The dipole should point to the more electronegative element in a bond of two elements. Example between O and F, the dipole would point to F. If two different dipoles point opposite directions they cancel each other out, if all cancel out the molecule is non-polar. If they have a net dipole moment then the molecule is polar.
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