Which of the following has the lowest vapor pressure?
Correct answer: A. Glycerol
- A. Glycerol
- B. Isopentane
- C. Ethanol
- D. Both Options A and C are correct
Explanation
Glycerol have lower vapor pressure compared to isopentane and ethanol. Vapor pressure is a measure of the tendency of a substance to evaporate and form a vapor. Higher intermolecular forces, such as hydrogen bonding in the case of glycerol lead to stronger attractions between molecules, making it more difficult for them to escape into the vapor phase.
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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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