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Chemical A is being converted into chemical R in a vessel packed with non-porous, spherical beads. The specific surface area of the bed is 60 ft?/ft? of packed bed, its bulk density is 180 lb/ft of packed bed and the porosity of the bed is 0.4. The stoichiometry is A2R and the rate if disappearance of A on unit mass of catalyst is proportional to the concentration of A present in the gas. Thus in English units, using hours, we found from experiment: 1 r A dN A dt = 0.1 0. W A 1. Write our the equation given, showing units of various terms 2. Find the expression of the rate equation: b. -r A