Problem $2$

Carbon dioxide and nitrogen experience equimolar counter$-$diffusion in a circular tube whose

length and diameter are $1m$ and $50mm,$ respectively. The system is at a total pressure of $1$

atm and a temperature of $25C.$ The ends of the tubes are connected to large chambers in

which the species concentrations are maintained at fixed values. The partial pressure of carbon

dioxide at one end is $70mmHg,$ while at the other end it is $20mmHg.$ What is the mass

transfer rate of carbon dioxide through the tube? $D_{C{O}_2-N_2}=0\mathrm{.}15c\frac{m^2}{s}$