5.21. We are planning to operate a batch reactor to convert A into R. This is a liquid reaction, the stoichiometry is A -> R, and the rate of reaction is given in Table P5.21. How long must we react each batch for the concentra- tion to drop from CAD 1.3 mol/liter to CA = 0.3 mol/liter? Table P5.21 -PA, mol/liter min CA, mol/liter 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 1.0 1.3 2.0 0.1 0.3 0.5 0.6 0.5 0.25 0.10 0.06 0.05 0.045 0.042 5.22. For the reaction of Problem 5.21, what size of plug flow reactor would be needed for 80% conversion of a feed stream of 1000 mol A/hr al CAD 1.5 mol/liter