Mass Transfer
Steady state equimolal counter diffusion is encountered in

All liquid-liquid diffusion systems
Separation of a binary mixture by distillation
Absorption of NH₃ from air by water
All of these

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

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