Question

For a gas mixture (A+B) equimolar counterdiffusion takes place. Which among the following statements are correct for molar flux?

(a) If temperature is doubled, the flux will get halved

(b) If diffusion length is halved, the flux will get halved

(c) If temperature is halved, the flux will get halved

(d) If temperature is doubled and length is halved, the flux will become four times

This question was posed to me in an online interview.

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

Answer 1

Correct answer is (a) If temperature is doubled, the flux will get halved

To explain: NA=(D*(P1-P2))/RTL……….(for equimolar counter diffusion).