H2O has higher boiling point than HF

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This is because the number of hydrogen bonds in water is more that of present in the HF molecule.
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For N HF molecules, there are 3N lone pairs and 1N H atoms, so at most N hydrogen bonds can form (even though an individual HF molecule can hydrogen bond to four other HF molecules). (c) HF and NH3 make fewer hydrogen bonds than H2O does, so H2O is expected to have a higher boiling point.
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