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Why is the boiling point of HF higher than that of HCl?
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HF is very polar and the hydrogen has a partial positive charge and the fluorine a negative. The molecules line up so that the opposite charges attract and hold the molecules together. This is called hydrogen bonding and also accounts for the high boiling point of water. HCl doesn't have this so it has a lower boiling point even though it is a heavier molecule.
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