Carbon dioxide is diffusing through nitrogen at steady-state
within a tube (0.2m long, 0.05m diameter). The partial pressure of
CO2 is maintained at 50kPa at one end, and 20 kPa at the other. The
total system pressure is constant throughout at 101.3 kPa, and the
temperature is 25 C (no bulk flow). At this temperature, the
diffusivity of CO2 through Nitrogen is 0.167 cm2/s. Calculate the
steady-state flow rate of CO2 within the tube in units of
mol/s.