The gaseous reaction A → B has a unimolecular reaction rate constant of 0.0015 min”1 at 80 °F. This reaction is to be carried out in parallel lubes 10 ft long and I in. inside diameter under a pressure of 132 psig at 260 °F. A production rate of 1000 lbm/h of B is required. Assuming an activation energy of 25,000 cal/mol, how many tubes are needed if the conversion of A is to be 90%? Assume perfect gas laws. A and B each have molecular weights of 58. (From California Professional Engineers Exam
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