The amount of heat absorbed when one mole of a liquid is changed into gas at its boiling point is_____________________?
Correct answer: C. Molar heat of vapourization
- A. Molar heat of sublimation
- B. Molar heat of fusion
- C. Molar heat of vapourization
- D. Latent heat of that liquid
Explanation
The heat required to convert one mole of liquid into gas at its boiling point is the molar heat, or molar enthalpy, of vaporization. It is measured per mole, whereas ordinary latent heat is generally expressed per unit mass. Students may choose d because it mentions latent heat, but it does not specify the required molar basis or vaporization process precisely.
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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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