The reaction A $+$ B $->$ S occurs in a system of a CSTR and a PFR reactor connected in series. the reaction $is$ in gaseous phase. The feed contains only the two reactants in identical concentrations. The temperature and pressure in system $200C$ and $5$atm. The kinetic expression is: r $=C_A{C}_B.$ The volume of the reactors is the same and equal to $1$L$.$ The volumetric flow rate of the feed is $1$L$/$min$.$ The conversion obtained when the first PFR and then $CSTR$ is followed after $is50\%.$

$a.$What is the conversion obtained after the PFR$?$

$b.$ What is the conversion you get if you reverse the order of the reactors?

$c.$ What is the conversion obtained if the reactors are arranged in parallel, with an equal distribution of volumetric flow Between the reactors?

$d.$Compare sections B and C$.$