A --> 3.2 R second-order gas phase reaction is carried out in a batch vessel at a total pressure of 4 atm and a temperature of 70 C. It is known that the reaction system initially consists of 60% A gas, 20% inert gas and 20% R. 55% 6 minutes after reaction onset Since the volume change is observed; a) Calculate the k-velocity constant of the reaction and the time taken for 80% conversion. b) Calculate the k-speed constant only in case of a 6-fold increase in the volume of the Batch Reactor, where other conditions are the same