Which of the following liquids would be expected to have the highest vapour pressure at room temperature?
Correct answer: C. Ether
- A. Water
- B. Glycerol
- C. Ether
- D. Mercury
Explanation
Ether has weak dispersion forces between its molecules, so a large fraction escape the surface easily and it is highly volatile, which is why it evaporates almost as soon as it is spilt. Water and glycerol are held by extensive hydrogen bonding and mercury by metallic bonding, all of which are far stronger. Vapour pressure and boiling point always run in opposite directions.
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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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