Why does ethanol (M = 46 g/mol) boil at a much higher temperature than propane (M = 44 g/mol)?
Correct answer C. Ethanol molecules form hydrogen bonds with one another
Explanation
The molar masses are almost equal, so London forces are similar. The O–H group lets ethanol molecules hydrogen bond, which needs much more energy to overcome, so its boiling point is far higher.
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