Gas A diffuses from point 1 to a catalyst surface at point 2 where it react as follows: 

                        2A-3 B Gas B diffuses back a distance o to point 1

(a): Derive the equation for Na for a very fast reaction using mole fraction units XA1 and so on. 

(b): For DAB=0.2*10-4 m²/s XA1= 0.97, P = 101.32 KP., 5= 1.3mm and T= 298 K. Solve for NA 

(c): Do the same as in part (a) but for a slow first order reaction. 

(d): Calculate NA and XA2 for part (c) where k₁ = 0.53*10-2 m/s.