A Mixed Flow Reactor is filled with $10L$ of an aqueous solution of $A.$ When the

concentration of A inside the reactor is $1mo\frac{l}{L},$ and an aqueous solution containing

$A$ at a concentration of $0\mathrm{.}1mo\frac{l}{L}$ is fed into the reactor at $2\frac{L}{m}in$ while

simultaneously extracting $2\frac{L}{m}in$ from the reactor:

Calculate the time required for the concentration of A inside the reactor to

decrease to $10\%$ of its initial concentration if A does not react.

Calculate the time required if A decreases according to the rate $-rA(mo\frac{l}{L}*min)$

$=0\mathrm{.}2(min-1)*CA(mo\frac{l}{L}),$ assuming there is no change in the density of the solution

due to concentration changes.