boiling point example

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boiling point example

Postby bellaha4F » Thu Nov 21, 2019 9:11 pm

in one of the worksheet answer key it says that the boiling point of KCl is higher than KI. however I thought that since I is bigger than Cl, KI should have a higher boiling point?

Baoying Li 1B
Posts: 113
Joined: Sat Aug 17, 2019 12:18 am

Re: boiling point example

Postby Baoying Li 1B » Thu Nov 21, 2019 9:18 pm

I think that the molar mass only works for London dispersion forces.
The dominant intermolecular force of KCl and KI is ion-ion which depends on the polarity. The higher the difference of electronegativity between elements, the higher the boiling point. Cl has a higher electronegativity than I. So KCl has a higher boiling force.

Deana Moghaddas 3E
Posts: 51
Joined: Fri Aug 30, 2019 12:17 am

Re: boiling point example

Postby Deana Moghaddas 3E » Thu Nov 21, 2019 10:44 pm

Cl is more electronegative than I so KCL has higher boiling point.

Miriam Villarreal 1J
Posts: 105
Joined: Sat Aug 17, 2019 12:16 am

Re: boiling point example

Postby Miriam Villarreal 1J » Fri Nov 22, 2019 11:11 am

The greater forces of attraction will result in higher boiling and melting points because It takes more energy to separate the molecules from each other. Meanwhile a nonpolar molecule such as is symmetrical and has no positive or negative end.

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