A. For 1-D steady-state diffusion in the z-direction, in which one molecule of A has a flux that is

equal and opposite to one molecule of B, draw (A) a plot of concentration versus z-distance

with curves for both CA and CB, and (B) a plot of partial pressure versus z-distance with curves

for both PA and PB.

B. In your own words, describe some key indicators that a mass-transfer situation should be

analyzed as pseudo-steady state diffusion (as opposed to steady or unsteady-state diffusion).