QUESTION $3$

Ammonia $(A)$ is diffusjing through a straight uniform tube $8cm$ long containing nitrogen $(B)$ at $25C$ and $1\mathrm{.}0$atm $($abs$)$ pressure. The partial pressure of ammonia at one end of the tube is constant at $10$kPa and at the other end it is $2$kPa. Both ends of the tube open into large mixed chambers at $1\mathrm{.}0$atm. The diffusion coefficient of ammonia in $N_2(D_{AB})$ is equal to the diffusion coefficient of $N_2$ in ammonia $(D_{BA})$ and is $0\mathrm{.}23c\frac{m^2}{s}$ at the process conditions.

Calculate the molar flux of $A$ in gmol$/($cm$^2.$s$)$ at steady$-$state.

Calculate the molar flux of $B$ in gmol$/($cm$^2.$s$)$ at steady$-$state.

The ideal gas constant $.$mol$),1$atm$=101\mathrm{.}325$kPa and $273\mathrm{.}15K=0C.$