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Stearic acid and linoleic acid are both long chain carboxylic acids with 18 carbon atoms. However, there is a vast difference in the melting points of these fatty acids. Stearic acid (18:0) melts at 70°C and linolenic acid (18:3) melts at -11°C. Explain why there is such a large difference in the melting points of these fatty acids.

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