Mass Transfer
Henry's law states that the

Vapour 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
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

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Mass Transfer
In a counter-current liquid extractor

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

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