Which of the following has lower vapor pressure?
Correct answer: A. Glycerol
- A. Glycerol
- B. Isopentane
- C. Ethanol
- D. Both Options A and C are correct
Explanation
Due to weaker intermolecular forces, vapor pressure of isopentane is more (580 torr) than glycerol ( 0.00016 torr).
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About Evaporation, Boiling Point and Vapour Pressure
Evaporation is the escape of higher-energy molecules from a liquid surface, while vapour pressure is the pressure exerted by vapour in equilibrium with that liquid. The topic distinguishes evaporation from boiling and relates both to temperature, intermolecular forces, surface area, atmospheric pressure and the boiling point.
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