Mass Transfer
In a counter-current liquid extractor

Both liquids can have any desired flow rate
Only one of the liquids may be pumped at any desired rate
Both liquids flow at fixed rate
Liquid's flow rate depends upon the temperature and pressure

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Mass Transfer
Henry's law states that the

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

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