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A binary liquid mixture is separated by distillation process. The more volatile A vaporizes while less volatile B gets transported in opposite direction. Latent heat of vaporization of A and B is 0.5unit and 1unit respectively. What will be the relation between molar flux of A and B

(a) NA=2NB

(b) 2NA=NB

(c) NA=4NB

(d) 4NA=NB

This question was addressed to me in quiz.

The question is from Diffusion in a Binary Gas Mixture topic in portion Diffusion in Solids and Molecular Diffusion in Fluids of Mass Transfer

1 Answer

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by (39.8k points)
The correct answer is (a) NA=2NB

For explanation I would say: Latent heat of vaporization of A is provided from condensation of B. NA∆HA=NB∆HB.

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