4. The following data were obtained for the irreversible, gas-phase reaction: A+ BR+S using an isothermal, ideal plug- flow reactor. The feed contained a stoichiometric mixture of A and B in N. The feed concentration of A was 0.005 mol/L. Space time, 7 (min) 200 600 Concentration of A in outlet, mol/l 0.00250 0.00125 Find: Show using the integral method whether or not the above data are consistent with the assumption that the reaction is second order overall. Do a quantitative analysis.