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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 $...
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