Consider a liquid phase reaction $A+R2R.$ The rate expression for $A$ is $-r_A=k{C}_A{C}_R,k$

is positive. $C_{A0}=2\frac{\text{m}\text{o}\text{l}}{L},C_{R0}=1\frac{\text{m}\text{o}\text{l}}{L}.$ The volumetric flow rate is constant.

a$.$ Sketch $\frac{F_{A0}}{-r_A}{x}_A$

b$.$ For $x_A=20\%.$ To achieve minimal total reactor volume, what's the combination

of reactors you should choose? $($Only $1$ CSTR; only $1$ PFR; $1$ CSTR$+1$ PFR; $1$

PFR $+1$ CSTR$).$ If you choose a combination of two reactors, to achieve minimal

total reactor volume, what's the conversion $x_A$ at the interface of reactors?

c$.$ For $x_A=50\%.$ To achieve minimal total reactor volume, what's the combination

of reactors you should choose? $($Only $1$ CSTR; only $1$ PFR; $1$ CSTR$+1$ PFR; $1$

PFR$+1$ CSTR$).$ If you choose a combination of two reactors, to achieve minimal

total reactor volume, what's the conversion $x_A$ at the interface of reactors?