The liquid phase isothermal reaction,

$A+B=C+D$

follows a $2$ nd order reaction $(1$st order in A and $1$st order in B$).$ The feed volumetric flowrate is $3\mathrm{.}0{10}^{-4}{m}^3{s}^{-1}.$ The feed is equimolar and the initial concentration of $A$ is $0\mathrm{.}12kmol{m}^{-3}.$ The rate constant is $1\mathrm{.}0{10}^{-2}{m}^{3}kmo{l}^{-1}{s}^{-1}.$ The reactor conversion is $70\%.$

Apply the graphical method,

$($a$)$ to determine the volume of a CSTR$.$

$($a$)$ to determine the total volume of a cascade of three identical CSTRs in series.