Chemical Bonding Worksheet With Answers Page 12
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12Secondary Bonding or van der Waals Bonding
2.23
Explain why hydrogen fluoride (HF) has a higher boiling temperature than hydrogen chloride (HCl)
(19.4 vs. –85°C), even though HF has a lower molecular weight.
Solution
The intermolecular bonding for HF i s hydrogen, whereas for HC l, the intermolecular bonding is van der
Waals. Since the hydrogen bond is stronger than van der Waals, HF will have a higher melting temperature.
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