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

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

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Vapour pressure of component A to the partial pressure of A
Vapour pressure of component A to the total pressure
Partial pressure of component A to the total pressure
Vapour pressure of component A to that of component B

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Mass Transfer
In steam distillation, the

Temperature is 100°C
Temperature is more than 100° C
Temperature is higher than the boiling point of either component
Product must be immiscible with water

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