Homework Help: Chemistry

Posted by LALA on Saturday, March 27, 2010 at 4:46pm.

How does the molar mass of molecules affect the boiling points?
e.g MOlar masses
HI-->127.9
HF--->20.07
HCl---> 36.45

Boling points
HI-->-35.55
HF---> 20
HCl--->-114.17

can it be said that except for HF molecule, as molar mass increases the boling points alos increases

Chemistry - DrBob222, Saturday, March 27, 2010 at 5:30pm
I think the boiling point you have for HCl is out. See, for example, http://www.transtutors.com/chemistry-homework-help/S-and-P-block-elements/hydrides-of-halogens.aspx

However, your conclusion is correct that boiling point increases, generally, as molar mass increases. HF is the one out of line because of H bonding.

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