Mass Transfer
Unit of molal diffusivity is

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

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Mass Transfer
When the liquid phase and vapour phase of a binary system obeys Raoult's and Dalton's law respectively, the relative volatility is the ratio of

Partial pressure of component A to the total pressure
Vapour pressure of component A to the total pressure
Vapour pressure of component A to that of component B
Vapour pressure of component A to the partial pressure of A

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Mass Transfer
A coalescer in a mixer-settler liquid-liquid extraction coloumn

All of these
Comprises of thin bed of substances of extended surface having high porosity
Helps in increasing the settling rate of the bubbles
Helps in increasing the bubble size entering the settler

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