Which of the following exerts the lowest vapour pressure?
Correct answer: C. Water
- A. Chloroform
- B. Methanol
- C. Water
- D. Ethanol
Explanation
The stronger the intermolecular forces, the lower the vapor pressure. Water has the strongest forces amongst these options (4 H-bonds), hence it will have the lowest vapor pressure.
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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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