H-bonding & temperature

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H-bonding & temperature

Postby 205192823 » Tue Nov 19, 2019 4:09 pm

I remember in discussion we were told that the temperatures for: H2O,H2S, H2Se, and H2Te went from high temp for H2O then drops down then starts from H2S and increases from then on to H2Te. I am a little confused on how this trend works.

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Joined: Wed Sep 18, 2019 12:19 am

Re: H-bonding & temperature

Postby Khushboo_3D » Tue Nov 19, 2019 6:21 pm

H2O will have the highest boiling point due to hydrogen bonding. For the remaining 3 compounds we consider London forces, which depends on the size of the atom. In this case, atoms grow bigger as we go down a group and so Te will be bigger than Se which will be bigger than S. Therefore of the remaining, H2Te will have the highest boiling point decreasing to H2S.
The textbook also gives the following reason stated as:
"the boiling points increase down the group because the strength of the London interaction increases."

Hope this helps!

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