QUESTION 4 (20 marks) A mixture of 28% SO2 and 72% air (composition of air: 79% nitrogen and 21% oxygen by volume) is fed to a Plug Flow Reactor (PFR) where SO2 is oxidized, 2502 + 02 2503. The reaction is carried out at constant pressure of 1485 kPa and constant temperature of 227 C. Copy the following stoichiometric table in your answer booklet and complete it for the above reaction in terms of initial molar flow rate (FAQ) and conversion (X) of SO2: 4.1 Initial Chemical SO2 Change Remaining O2 Symbol B Inert species SO3 N2 (11 marks) 4.2 Determine the following: (a) the initial concentration of SO2 in the feed; (2 marks) (b) the values of 8 (change in total number of moles per mole of A reacted) and (change in total moles for complete conversion per mole of feed to the reactor); and (4 marks) (c) the concentration of SO3 at the exit of the PFR when the conversion of SO2 is 80%