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At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity?

At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity? Correct Answer In a very dilute solution

In a very dilute solution, the contribution of the bulk flow term becomes negligible. NA= (NA+NB)CA/C – DABdCA/dz (general equation) (NA+NB)CA/C =0 (in dilute solution) NA= -DABdCA/dz = JA.

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Only if the calculated molar mass is higher than the actual molar mass of the solute, the calculated molar mass is considered to be abnormal molar mass.