A 2B gas phase reaction takes place at 5 atm and 215 °C in an isothermal piston flow reactor. There is no pressure drop in the reactor. The feed stream contains 60% A and 40% inert material. The volumetric flow rate of the feed stream is 0.5 L/sec. The reaction rate equation is -rA = kCA. The reaction rate constant is k = 0.01 sec^-1 (R = 0.082 L.atm/molK). Calculate the volume of the plug flow reactor (PFR) required to achieve 80% conversion.