Mass Transfer
The solvent used in liquid-liquid extraction should have __________ less than one.

Selectivity
Distribution co-efficient
Neither A nor B
Both A & B

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Mass Transfer
McCabe-Thiele method

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

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Mass Transfer
Henry's law states that the

Partial pressure is equal to the product of the mole fraction and total pressure
Partial pressure of a component over a solution is proportional to the mole fraction in the vapour
Partial pressure of a component over a solution is proportional to its mole fraction in the liquid
Vapour pressure is equal to the product of the mole fraction and total pressure

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