$8\mathrm{.}2.$ Under appropriate conditions A decomposes as follows:A k$,-0\mathrm{.}1/$min Rk$2-0\mathrm{.}1/$min$+$ sR is to be produced from $1000$ liter$/$hr of feed in which CAo $=1$ mol$/$liter$,$CRO $=$ Cs$0=0.($a$)$ What size of plug flow reactor will maximize the concentration of R$,$ and what is that concentration in the effluent stream from this reactor?$($b$)$ What size of mixed flow reactor will maximize the concentration ofR, and what is CR$,$max in the effluent stream from this reactor?