please answer as soon as possible, i need to pass it now. thank you

Chemical A is being converted into chemical R in a vessel packed with non porous, spherical catalyst beads. The specific surface area of the catalyst is 60 ft^3/ft^3 of packed bed, its bulk density is 180 lb/ft^3 of packed bed, and the porosity of the bed is e=0.40. The stoichiometric equation is A ---> 2R and the rate of disappearance of A based on unit mass of catalyst is proportional to the concentration of A present in the gas. Thus in English units, using hours, we find from the experiment the rate equation below. THE negative sign shows the rate of change is negative, or that A disappears. 1 dNA = 0.1CA W dt