Mass Transfer
Relative humidity is the ratio of the

Partial pressure of the vapour to the vapour pressure of the liquid at gas temperature
Partial pressure of the vapour to the vapour pressure of the liquid at room temperature
Actual humidity to saturation humidity
None of these

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Can use any type of units
Uses molal units for material and energy balance

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Mass Transfer
When the solvent dissolves very little of solute, then

Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required
Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used

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