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Mass Transfer - Engineering

Q1:

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.)

A Kc = Kp = Km

B Kc = Kp/RT = Km . RT/P

C Kc = Kp . RT = Km . RT/p

D none of these

ANS:C - Kc = Kp . RT = Km . RT/p

The relation among various mass transfer coefficients (M.T.C) for ideal gases is given by: 𝐾𝑐=𝐾𝑝=𝐾𝑚Kc​=Kp​=Km​ This equation states that for ideal gases, the mass transfer coefficients for equimolar counter diffusion with concentration (𝐾𝑐Kc​), for diffusion of a gas through a stagnant inert gas with pressure as the driving force (𝐾𝑝Kp​), and for equimolar counter diffusion with mole fraction (𝐾𝑚Km​) are all equal. Therefore, the correct option is: 𝐾𝑐=𝐾𝑝=𝐾𝑚Kc​=Kp​=Km​.