Question

15. Mole balance As shown in the figure below, liquid A evaporates in the zdirection and passes throug yer of gas B occupying the region bet above z- L Let us suppose that the species A undergoes a first-order chemical reaction (C) at zL. Furthermore, the diffusion coefficient (Da) of species A varies with its mole fraction (xa) as DA D (1-x,) where D is a constant Find the steady-state concentration (or mole fraction) ween z-0 and zl There exists a reactive catalyst layer pr file of specieSA as a function of z Use the boundary condition of X,-X,o at Z-o Assume =x,0 at z=0. Assume that diffusion occurs only in the z-direction and the total concentration C of the gas mixture is maintained as constant with a fixed temperature and pressure (for an integration constant associated with the boundary condition at zL it is sufficient to give only the equation without a need to explicitly calculate the constant). RC A+B

Answer 1