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

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

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Mass Transfer
For absorbing a sparingly soluble gas in a liquid

Liquid side mass transfer co-efficient should be decreased
Liquid side mass transfer co-efficient should be increased
Mass transfer co-efficient must be kept constant
Gas side mass transfer co-efficient should be increased

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