Carbon dioxide (A) and nitrogen (B) are in equimolar counter diffusion in a circular tube whose length and diameter are 1 m and 50 mm respectively. The system is at a total pressure of 2.0265105 Pa and a temperature of 555 K. The ends of the tube are connected to large chambers in which the species concentrations are maintained at fixed values. The partial pressure of CO2 at one end is 0.2105 Pa, while at the other end, it is 0.1105 Pa.

a) What is the flux of CO2 through the tube at steady state, J* A?

b) What is the partial pressure or the mole fraction of CO2 at the middle of the tube? BE CAREFUL: High temperature and high pressure system. Dffusivity DAB for CO2 and N2 = 1.6710-5 m2 /s at 298 K and 1.0132105 Pa