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Voiceover
The molecular formulas for butanol and diethyl ether are the same, but their structures are different. Butanol molecules form hydrogen bonds, while diethyl ether molecules can only form dipole-dipole interactions.

When butanol is injected into the open end of the barometer, the mercury column is depressed to 721 millimeters. However, when diethyl ether is injected, the column is depressed to 263 millimeters.

Diethyl ether has a much higher vapor pressure than butanol. Diethyl ether has only intermolecular dipole-dipole forces, much weaker than the hydrogen-bond intermolecular forces of the butanol.