Which of the following liquids has the lowest vapor pressure at room temperature, 25°C? methanol, $CH_3OH$; boiling point 64.9°C ethanol, $CH_3CH_2OH$; boiling point 78.5°C water, $H_2O$; boiling point 100°C ethylene glycol, $HO-CH_2CH_2-OH$; boiling point 198°C
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Methanol, ethanol, and water all have hydrogen bonding, which is a strong intermolecular force. Ethylene glycol also has hydrogen bonding, but it also has additional dispersion forces due to its larger molecular size. Show more…
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