Please solve and show all the equations and details

A tube with 1cm of inside diameter and 20cm of length is fllled with CO2 and H2 at a total pressure of 2 atm at 0C. The diffusion coefficient of the CO2H2 system under these conditions is 0.275cm2/s. If the partial pressure of CO2 is 1.5atm at one end of the tube and 0.5 atm at the other end, calculate molar flow rate, FA(mol/s) for: a) Steady-state equimolar counter diffusion b) Stead-state diffusion of CO2 through stagnant H2 R=82.05cm3atm/molK C=P/RT