WAEC Chemistry 2021 Theory — Question 9
Question 9 of 31 from the West African Examinations Council (WAEC) Chemistry 2021 Theory paper, with the correct answer and a full explanation.
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1(i). Explain briefly why ethanol has a higher boiling point than propane even though they both have comparable molar masses.
Model answer
Ethanol molecules form strong intermolecular hydrogen bonds (via the O-H group), which are stronger than the weak Van der Waals forces present between propane molecules, so more energy is needed to separate ethanol molecules, giving it a higher boiling point.
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