The isothermal, isobaric, elementary gas phase reaction 2A --> B is carried out in 3 different types of reactors. A batch reactor, a CSTR and a PFR. Given that pure A is fed at a temperature of 500 K, and pressure of 8,2 atm, determine the time or space time for the 3 types of reactors. Data: X = 0.9; CA0 = 0.2 mol/dm3; k = 0.5 dm3/mol.s; vo = 2.5 dm3/s