Mass Transfer
In case of non-ideal gases and liquids, the molal diffusivity

Varies directly as the pressure
Is independent of pressure
Varies inversely as the pressure
Is equal to the volumetric diffusivity

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Mass Transfer
Relative volatility varies with the concentration of component for an ideal solution. The relative volatity of a binary mixture may be defined as the ratio of vapor pressure of component 'A' to that of component 'B', when

Only vapor phase follows Raoult's law
Only liquid phase obeys Dalton's law
Liquid phase obeys Dalton's law and vapor phase obeys Raoult's law
Vapor phase obeys Dalton's law and liquid phase obeys Raoult's law

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