$1\mathrm{.}1.$ A site has two plug flow reactors and a CFSTR placed in series. Plot C$/$CO vs HRT for this configuration. Assume the reaction rate $=-$KC$,$ where K$=0\mathrm{.}15$d$-1.$

$1\mathrm{.}2.$ The site removes the plug flow reactors and adds two additional CFSTRs$,$ for a total of $3.$ Plot the new C$/$Co with respect to HRT$.$ Assume the reaction rate $=-$KC$,$ where K$=0\mathrm{.}15$d$-1.$

$1\mathrm{.}3.$ Compare the two plots and explain the differences between them.

$2\mathrm{.}1.$ Walnut Creek Wastewater Treatment Plant located in Austin, Tx has three reactors in series. The first reactor is a plug flow, the second reactor is a CFSTR$,$ and the final reactor is another plug flow. Assuming that all the reactors have the same HRT$,$ plot the tracer output for a pulse input of tracer for this set of reactors. K $=0\mathrm{.}1$d$-1.$

$2\mathrm{.}2.$ Walnut Creek decides to add another Plug Flow reactor to the series, how might this effect the tracer plot from question $5$a$?($No Plot necessary$)$