A reaction: A → R is carried out in a porous catalyst sediment (dp = 6 mm, De = 10-6 m3 / mcat S). Calculate by what percentage the speed decreases due to the resistance to diffusion in the pores, if the concentration of the reagent surrounding the tablet is 100 mol / m³ and the kinetics, free of diffusion effects, is: RA = 0.1 CA ² mol / m³cat second