The observed reaction rate of a first-order catalytic reaction, which takes place in spherical particles of 20 mm in diameter, is equal to _, = 30 mol s m³_cat. The reaction rate at bulk fluid conditions has been estimated experimentally to be _, = 180 mols m³_cat. Calculate, for this catalytic reaction, the effectiveness factor for external mass transfer and the relevant Damkhler II number, and comment on the results.