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Hydrogen Bonding in Water Phase Changes

How is the disparity between the heat of fusion and the heat of vaporization for $\ce{H2O}$ best explained? A) It takes more hydrogen bonds for water to fuse than it does to vaporize. B) Water ...
1
vote
1answer
866 views

Molecules having higher enthalpy of vaporization and boiling point than another but with lower entropy of vaporization?

I came across the Trouton's rule that predicts the entropy of vaporization of most molecules to be around 85~88kJ/(K mol). It is said to fail when there is hydrogen bond between molecules. When I ...
7
votes
1answer
2k views

Specific Heat Capacity of Heavy Water

Water has an unusually high specific heat capacity due to it's hydrogen bonds. Why is it that the change in isotope causes a 10% difference in the heat capacity? How does the added neutron in the ...
19
votes
5answers
51k views

Why does hydrogen fluoride have a boiling point so much lower than that of water?

$\ce{F}$ has more unshared electron pairs and is very electronegative, so $\ce{H}$ of another $\ce{HF}$ molecule can $\ce{H}$-bond with it. $\ce{HF}$ has normal boiling point of $\pu{19.5^oC}$ while $...