The quantity of heat required to convert one mole of liquid into its vapours at its boiling point is called molar heat of__________________?
Correct answer: A. vaporization
- A. vaporization
- B. evaporation
- C. crystallization
- D. sublimation
Explanation
The molar heat of vaporization is the heat needed to convert 1 mole of liquid into vapour at its boiling point without changing temperature. Students may choose evaporation, option b, because evaporation also forms vapour, but the standard thermodynamic term for the molar phase change is vaporization.
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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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