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Author Topic: Arranging Molecules by Boiling Points  (Read 4470 times)

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jamesbond007

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Arranging Molecules by Boiling Points
« on: July 01, 2009, 02:07:08 PM »

Pentane, 1-butanol, and butanal all have approximately the same molecular weights, but different boiling points.  Arrange them in order of increasing boiling points.  Explain the basis for your ranking.
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superman650

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Re: Arranging Molecules by Boiling Points
« Reply #1 on: July 01, 2009, 02:16:11 PM »

Here is the answer to your question about <a href="http://www.coursehero.com/file/46547/Chemistry-222-Chapter-9-Problems-with-Answers/"> Arranging Molecules by Boiling Points</a> on Course Hero

I also provided the explanation below:

Pentane has the lowest boiling point, butanal is next, and 1-butanol has the highest boiling point.  Pentane is nonpolar and its molecules do not associate strongly.  In liquid butanal, the molecules associate via the attraction between the partial charge on the carbonyl carbon of one molecule and the partial negative charge on the carbonyl oxygen of another molecule.  1-butanol is not only polar (like butanal)—it can make hydrogen bonds.  This gives it the highest boiling point of the three molecules.
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