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April 18, 2014

Homework Help: chemistry

Posted by marc on Monday, February 4, 2008 at 8:03pm.

Hexane is a hydrocarbon (a molecule containing only carbon and hydrogen) with a molecular weight of 86.18 g/mol,
a density of 0.660 g/mL, and a boiling point of 69C .

Pentanol is an alcohol (a hydrocarbon with a "OH" group attached to one of its carbons) with a molecular weight of
88.15 g/mol, a density of 0.814 g/mL, and a boiling point of 137C .


Pentanol has the higher boiling point. Why?
A. Hydrogen bonding requires that a pentanol molecule have more energy to escape the liquid phase.
B. Pentanol is capable of hydrogen bonding, so it goes into the gas phase more easily.
C. Hexane has stronger intermolecular forces, so it boils at a lower temperature.
D. The higher molecular weight of pentanol results in a higher boiling point.
E. The dispersion forces in hexane are weaker.

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