A substance is cooled for sixteen minutes according to the cooling curve shown. Describe
what happens to both the potential energy and the
kinetic energy of the molecules of the substance
between minute 4 and 6 of cooling.

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"

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Melting increases as mass increases. since alkanes are not branched molecular structures, the one with the heavier mass will have higher melting point.  octane's mp > butane's mp