P15-5 A first-order heterogeneous irreversible reaction is taking place plated with platinum throughout the pellet (see Figure iS-3). r=R/2 ) is equal to one-tenth the conbetween the external surface and the center of the pellet (i.e., r= external surface is 0.001gmol/dm3, centration of the pellet's external surface. The concentration at the exter (2R)is2103cm,andthediffusioncoefficientis0.1cm2/s. (a) What is the concentration of reactant at a distance of 3104cm in from the external pellet surface? (Ans.: CA=2.36104mol/dm3 ) (b) To what diameter should the pellet be reduced if the effectiveness factor is to be 0.8 ? (Ans.: dp= 6.8104cm. Critique this answer!) (c) If the catalyst support were not yet plated with platinum, how would you suggest that the catalyst support be plated after it had been reduced by grinding? P15-5 A first-order heterogeneous irreversible reaction is taking place plated with platinum throughout the pellet (see Figure iS-3). r=R/2 ) is equal to one-tenth the conbetween the external surface and the center of the pellet (i.e., r= external surface is 0.001gmol/dm3, centration of the pellet's external surface. The concentration at the exter (2R)is2103cm,andthediffusioncoefficientis0.1cm2/s. (a) What is the concentration of reactant at a distance of 3104cm in from the external pellet surface? (Ans.: CA=2.36104mol/dm3 ) (b) To what diameter should the pellet be reduced if the effectiveness factor is to be 0.8 ? (Ans.: dp= 6.8104cm. Critique this answer!) (c) If the catalyst support were not yet plated with platinum, how would you suggest that the catalyst support be plated after it had been reduced by grinding