Mass Transfer
Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their

Density
Relative volatility
Solubility
Viscosity

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Mass Transfer
In a counter-current liquid extractor

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

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