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

• A. K c = K p = K m
• B. K c = K p / RT = K m . RT / P
• C. K c = K p . RT = K m . RT / p
• D. none of these