In an experiment conducted in the laboratory, the following data were obtained for the transformation of substance A into substance B $($A B$).$

t$,$ minute CA$,$ mmol$/$L

$024\mathrm{.}0$

$513\mathrm{.}2$

$107\mathrm{.}2$

$154\mathrm{.}0$

$202\mathrm{.}2$

$251\mathrm{.}2$

$300\mathrm{.}7$

$400\mathrm{.}2$

a$)$ What is the order $($n$)$ and rate constant $($k$)$ of this reaction?

b$)$ Only the outlet stream is taken from the $100$ L filled CSTR reaction vessel, which initially contains $24$ mmol$/$L substance A$,$ with a flow rate of Qout $=4$ L$/$min$.20.$ What is the concentration of substance B in the outlet stream at the minute and when the reactor is fully discharged?