Question

Under which of the following conditions mass average velocity and molar average velocity are equal?

(a) In a very dilute solution

(b) If molecular weights of all the species are equal

(c) Always different

(d) In dilute solutions as well as in solutions in which all components have same molecular weights

This question was addressed to me in an interview.

The doubt is from Concentration and Velocity in section Modes and Diffusion of Mass Transfer

Answer 1

Right choice is (d) In dilute solutions as well as in solutions in which all components have same molecular weights

To elaborate: None.