Mass Transfer
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)

Kc = Kp . RT = Km . RT/p
Kc = Kp/RT = Km . RT/P
Kc = Kp = Km
None of these

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Mass Transfer
To get high tray efficiency

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

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