Which one of the following has highest volatility_________________?
Correct answer: A. Diethyl ether
- A. Diethyl ether
- B. Ethyl alcohol
- C. Water
- D. Ethylene glycol
Explanation
Diethyl ether has weaker intermolecular attractions and a lower boiling point than ethanol, water, and ethylene glycol, so it escapes into the vapour phase most readily. Students may choose water because it evaporates commonly, but common use does not mean highest volatility.
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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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