Mass Transfer
Steady state equimolal counter diffusion is encountered in

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

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Mass Transfer
In saturated gas, the

None of the listed here
Vapour is in equilibrium with the liquid at the gas temperature
Partial pressure of vapour equals the vapour pressure of the liquid at room temperature
Vapour is in equilibrium with the liquid at the room temperature

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