Mass Transfer
Unit of molal diffusivity is

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

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Mass Transfer
When the solvent dissolves very little of solute, then

Solvent of low latent heat of vaporisation should be used
Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Very small quantity of solvent is required

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