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Chemistry Level 2

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Melting point of Neo-pentane \square melting point of pentane.

Boiling point of Neo-pentane \square boiling point of pentane.

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1 solution

Lu Chee Ket
Feb 15, 2016

Neopentane molecules pack better into a crystalline lattice, so more energy is required to melt the solid; thus its melting point is the highest of the three isomers. In contrast, in a liquid the long n-pentane is in closer contact with one another than the neopentane spheres do, so intermolecular van der Waals forces are stronger, and the boiling point of n-pentane is highest of all.

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