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C5H12 has a higher boiling point because as the molecule increases in size, there is more surface area for Van Der Waals forces to attract the molecule, and thus making the IMF of C5H12 molecule stronger and the boiling point higher.
Larger and heavier molecules have stronger London dispersion forces. C5H12 is a bigger molecule, therefore C5H12 has stronger LDFs and you will need a higher temperature to break apart these attractive forces so C5H12 has a higher boiling point.
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