Two vessels containing A and B are connected by a tube having a converging and a diverging

section. The partial pressure of oxygen in vessel $1$ is pA$1=0\mathrm{.}3$ bar and that in vessel $2$ is pA$2=0\mathrm{.}1$ bar.

The total pressure is $1\mathrm{.}013$ bar in both the vessels and the temperature is $20\backslash$deg C$.$

$($a$)$ Calculate the rate of diffusion of A through the tube at steady state $-10$

$($b$)$ What would the partial pressure of B and its gradient at the point of smallest cross section be$?-10$

DAB $=0\mathrm{.}153$ cm$2$

$/$s; r$1=5$ cm; r$2=10$ cm; throat radius $=2\mathrm{.}5$ cm; length of the two sections, l$1=12$

cm$,$ l$2=20$ cm