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How do you account for the trend of melting points in this series of acids? octanoic (caprylic) C8H16O2 at 17.5 degrees C, decanoic (capric) C10H20O2 at 31.5 degrees C, dodecanoic (lauric) C12H24O2 at 44 degrees C, tetradecanoic (myristic) C14H28O2 at 55 degrees C, hexadecanoic (palmitic) C16H32O2 at 63 degrees C, octadecanoic (stearic) C18H36O2 at 71 degrees C, and eicosanoic (arachidic) C20H40O2 at 77 degrees C.

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