Mass Transfer
Unit of molal diffusivity is

Gm moles/cm² . sec
Gm moles/cm². sec
Gm moles/cm. sec
Cm²/sec gm . mole

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
All of these
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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Mass Transfer
In a counter-current liquid extractor

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

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