Nitric oxide (NO) emissions from automobile exhaust can be reduced by using a catalytic converter, and the following reaction occurs at the catalytic surface: NO + CO → ½ N₂ + CO₂. The concentration of NO is reduced by passing the exhaust gases over the surface, and the rate of reduction at the catalyst is governed by a first-order reaction of the form given by Equation 14.66. As a first approximation it may be assumed that NO reaches the surface by one-dimensional diffusion through a thin gas film of thickness L that adjoins the surface. Referring to figure, consider a situation for which the exhaust gas is at 500°C and 1.2 bars and the mole fraction of NO is X_A,L = 0.15. If D_AB = 10^-4 m²/s, k''₁ = 0.05 m/s, and the film thickness is L = 1 mm, what is the mole fraction of NO at the catalytic surface and what is the NO removal rate for a surface of area A = 200 cm²?