The relative lowering of vapour pressure is directly proportional to molality if the solution is________________?
Correct answer: B. dilute
- A. concentrated
- B. dilute
- C. saturated solution
- D. all of the above
Explanation
For a dilute solution of a non-volatile solute, the relative lowering of vapour pressure equals the mole fraction of solute and is approximately proportional to molality. The likely wrong choice is concentrated solution, where the simple proportional relationship with molality is not generally valid.
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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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