Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?
Correct answer: D. There is equimolar counter diffusion
- A. Mass transfer is accompanied by reaction
- B. Diffusion of A is in stagnant medium B
- C. Molecular mean free path is high
- D. There is equimolar counter diffusion
Explanation
The stationary-point flux equals the molecular diffusion flux when there is no net bulk molar movement. Equimolar counterdiffusion provides equal and opposite molar fluxes, so the total molar flux is zero.
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