Mass Transfer
Steady state equimolal counter diffusion is encountered in

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

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Mass Transfer
In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because

Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Total pressure is less
Temperature is less
Saturated steam is used for steam distillation

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