The irreversible liquid phase reaction,

$4A+1B5C$

takes place in an isothermal PBR$.$ The reaction has an elementary rate law with $k_A=2\mathrm{.}50d\frac{m^3}{s}-kg$ catalyst. The entering stoichiometric mixture of reactants has a volumetric flow rate of $1\mathrm{.}85d\frac{m^3}{s}$ with the initial concentration of limiting reagent A being $1\mathrm{.}20mo\frac{l}{d}{m}^3.$

Graph how the concentration of all species changes with $x$

Graph how the catalyst weight changes with $x$

At what $\%$ conversion should you design for this reaction? Why? Please put the conversion in the answer box.

$\frac{4}{5}$