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

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

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Mass Transfer
To get high tray efficiency

Time of contact between the two phases should be less
Gas velocity should be very low
Liquid entrainment should be severe
Interfacial surface between liquid and gas phase should be large

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