Boltzmann Equation for Entropy:
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A greater dipole moment means that the molecules experience more attraction to one another and lie head-to-tail in a more orderly fashion, so their residual entropy is lower. Molecules with smaller dipole moments can be in either direction, resulting in a higher residual entropy.
Lower dipole moments mean that molecules are able to move more freely as opposed to being held tightly by stronger dipole moments. Moving freely= more positions can be occupied --> higher residual entropy
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