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

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Mass Transfer
Plate towers are preferred to packed towers, when large temperature changes are involved, because of the reason that the

Packing may be crushed due to thermal expansion/contraction of the components of the equipments
None of these
Pressure drop in the equipment will be very high
Viscosity variation of the fluids may cause channeling/flooding

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