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Does anyone know if we need to look at the formal charges when determine whether the dipole moments cancel or not? I know we need to draw the lewis structure and consider the shape first. And then see if the partial charges cancel or not. But is formal charge related to partial charges and the concept of dipole moments?
I think you're supposed compare the electronegativity of the atoms and their respective arrangement in the shape of the molecule; this should help you determine dipole moments. This in turn should help determine polarity.
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