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26.22 Consider the simplified process shown in the figure below, which is designed to treat a gas-phase mixture of trichloroethylene (TCE) in air by degrading the TCE within a porous catalyst layer of 0.50cm thickness lining one side of a well-mixed chamber. The inlet composition of TCE is 5.0 mole\%, but the treated gas exiting the process must contain no more than 2.0 mole\% TCE. The process is carried out at 300C and 1.0atm total system pressure. At these conditions, the degradation of TCE within the porous catalyst layer is approximated as a homogeneous first-order reaction process with rate constant (k) of 1.5s1. The effective diffusion coefficient of TCE in air within the porous layer is 0.080cm2/s. The gas mixing within the chamber is sufficiently high so that the gas space over the catalyst layer is well mixed and convective (boundary layer) resistances are minimized, resulting in cAo=cA=cAs. a. What relationships best describe the boundary conditions for mass transfer in the system? b. What is the mole fraction of TCE in the porous catalyst layer at z=L, the point where the porous catalyst layer is attached to its nonporous support surface? c. If the process must be designed to remove 0.20gmoleTCE/s from the gas stream, what is the required external surface