HW 3F.15

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Edmund Zhi 2B
Posts: 118
Joined: Sat Jul 20, 2019 12:16 am

HW 3F.15

Postby Edmund Zhi 2B » Wed Nov 13, 2019 4:46 pm

Can someone please explain why AsF3 has a boiling point of 63C while AsF5 has a boiling point of -53C?

Lindsey Chheng 1E
Posts: 110
Joined: Fri Aug 30, 2019 12:16 am

Re: HW 3F.15

Postby Lindsey Chheng 1E » Wed Nov 13, 2019 5:52 pm

Edmund Zhi 1J wrote:Can someone please explain why AsF3 has a boiling point of 63C while AsF5 has a boiling point of -53C?

Since AsF3 has a lone pair in its structure, it has a net dipole moment and exhibits polar characteristics. Meanwhile, AsF5 has no net dipole moment and is nonpolar. Therefore, it will take more energy to overcome the bonds in AsF3 than AsF5, hence the higher boiling point of AsF3.

Abigail Sanders 1E
Posts: 112
Joined: Wed Sep 11, 2019 12:16 am

Re: HW 3F.15

Postby Abigail Sanders 1E » Wed Nov 13, 2019 7:27 pm

AsF3 has a higher boiling point than AsF5 as AsF3 is polar and thus has dipole-dipole interactions between molecules. AsF5 on the other hand, is non-polar and thus only has weak London Forces. Due to the stronger dipole-dipole interactions, it is harder to break the bonds in AsF3 and thus its boiling point is higher.


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