The boiling points at atmospheric pressure of | vedclass

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Question

(A) The boiling point of a substance depends on the strength of intermolecular forces. $HF$ exhibits strong intermolecular hydrogen bonding,which lead

Vedclass · Accepted Answer

$HF > NH_3 > H_2S$

Vedclass · Answer

(A) The boiling point of a substance depends on the strength of intermolecular forces. $HF$ exhibits strong intermolecular hydrogen bonding,which leads to a significantly higher boiling point $(293 \ K)$. $NH_3$ also exhibits hydrogen bonding,but it is weaker than in $HF$ because $N$ is less electronegative than $F$,resulting in a lower boiling point $(240 \ K)$. $H_2S$ does not exhibit significant hydrogen bonding and relies on weaker dipole-dipole interactions,resulting in the lowest boiling point among the three $(213 \ K)$. Therefore,the correct order is $HF > NH_3 > H_2S$.

The boiling points at atmospheric pressure of $HF$,$H_2S$,and $NH_3$ can be arranged in the following order:

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