A tube with an inside diameter of 1 cm and length of 20 cm is filled with CO2 and H2 at a total pressure and a temperature of 2 atm and 0, respectively. The diffusion coefficient of the CO2-H2 system under these conditions is 0.275cm2/s. If the partial pressure of CO2 is 1.5 atm at one end of the tube and 0.5 atm at the other end, find the rate of diffusion for the following cases: a) St-st equimolar counter diffusion b) St-st counter diffusion where NB= -0.75 NA c) St-st diffusion of CO2 through stagnant H2