Chemistry- electronegativity and bonding (1 Viewer)

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the temperature for the following to reach a pressure of 100mmHg is as follows(celcius))

HI -> -72.1
HCl -> -114
HBr -> -97.7
HF -> -28.2

how can this be? since they are all combinations of H and an element of the last column before the noble gas surely the smaller the size of the molecule, the higher the temperature will be? since they are all a combination of H and an atom whose radius goes R=(F<Cl<Br<I) so the electronegativity goes (F>Cl>Br>I). surely the temp should go with the electronegativity??
 

chemisttree

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It might be a combination of electronegativity, mass, hydrogen bonding, size, etc....
 

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