$(4$e $25\mathrm{.}13,6$e $25\mathrm{.}8)$ For safety reasons, a catalytic converter must convert residual $CO$ to $C{O}_2$ before it

can be exhausted. Approximate the inlet gas as $1$mol$\%CO(A)$ in $99mo{l}_O{O}_2($B$).$ The reactor is a

rectangular slab with catalyst on the top and bottom walls as shown. The reaction is very rapid and the

equilibrium favors complete combustion of $CO.$ Assume that the velocity profile is flat i$.$e$.v_x=v.$

a$.$ List the control volume $($domain$),$ the species to be modeled, and the sources and sinks of each

species.

b$.$ List the variables and assumptions about mass transfer that will affect your model.

c$.$ Write the continuity equation in terms of the molar flux. Cross out any terms that are zero.

d$.$ Write the flux equation for this system.

e$.$ Write the initial and boundary conditions.

f$.$ Should the fluxes and concentration gradients be positive or negative?