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Jessica Li 4F
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Joined: Fri Aug 09, 2019 12:16 am


Postby Jessica Li 4F » Tue Nov 12, 2019 9:09 pm

Why does the different structure of the 2 molecules, pentane and 2,2-dimethylpropane, make their boiling points different?

Brooke Yasuda 2J
Posts: 102
Joined: Sat Jul 20, 2019 12:17 am

Re: 3F19.c.

Postby Brooke Yasuda 2J » Tue Nov 12, 2019 9:33 pm

In this case, both molecules have both induced dipole induced dipole and dipole dipole intermolecular forces, but because pentane is a much smaller molecule, it has less electrons and a smaller surface area. Because of this, pentane will have weaker induced dipole induced dipole forces, and therefore, have a lower boiling point.

Ashley Nguyen 2L
Posts: 103
Joined: Sat Aug 17, 2019 12:18 am
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Re: 3F19.c.

Postby Ashley Nguyen 2L » Wed Nov 13, 2019 2:05 am

Although both molecules are composed of the same atoms, they have different structures which impacts the types of bonds they make. Both molecules create induced dipole-induced dipole bonds, but the strength of these forces differ because of the size of the molecules. Pentane is a smaller molecule so it has a stronger attractive on its electrons, making it less polarizable. Therefore, it will have a weaker induced dipole-induced dipole force, which requires less energy to break the bonds, creating a lower boiling point.

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