Hw Problem (boiling point)

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aphung1E
Posts: 101
Joined: Sat Aug 24, 2019 12:15 am

Hw Problem (boiling point)

Postby aphung1E » Sun Nov 24, 2019 8:00 pm

Can someone explain how to find which has highest to lowest boiling point: H2S, H2O, KCl, KI

Harry Zhang 1B
Posts: 101
Joined: Sat Sep 14, 2019 12:16 am

Re: Hw Problem (boiling point)

Postby Harry Zhang 1B » Sun Nov 24, 2019 8:11 pm

Ionic bond is the strongest bond and therefore KCl and KI will have higher boiling points than H2S and H2O. Between KCl and KI, because the iodine atom is larger than Cl and is more polarizable, the bonds between KCl formula units have some covalent character and is therefore weaker than KCl. Between H2S and H2O, H2S only has intermolecular forces of london dispersion force and dipole-dipole interaction, while H2O has both of those plus hydrogen bonding, which makes the intermolecular bonds between H2O molecules stronger and harder to break.


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