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How does the rotation of various energy orientations work in dipole-dipole forces? Essentially, what does the explanation for figure 3F.5 mean?
Alright, I'll pretty much paraphrase the paragraph above the figure. In the gas phase, molecules are rotating rapidly. An assumption you can make is that there is no net interaction between the molecules because the attraction between opposite charges are canceled by the repulsion of like charges. This isn't true though because the rotating molecules stay in the low energy orientation longer, creating a net attraction. Being lower in energy means more stability, so that is why molecules favor this state more.
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