For the two PFRs in series, $40\%$ conversion is achieved in the first reactor. What is the

volume of each of the two reactors necessary to achieve $80\%$ overall conversion of the

entering species A$?$ Entering molar flow rate is $0\mathrm{.}4$ mol$/$s$.$

X $0\mathrm{.}00\mathrm{.}10\mathrm{.}20\mathrm{.}40\mathrm{.}60\mathrm{.}70\mathrm{.}8$

$[$ FA$0$

$/$rA$]0\mathrm{.}891\mathrm{.}091\mathrm{.}332\mathrm{.}053\mathrm{.}545\mathrm{.}068\mathrm{.}0$