$1-(15$ pts$)$ A gas$-$phase, exothermic reaction $AB$ is conducted in two tubular reactors packed with a solid catalyst. Both reactors have the same diameter $($but$,$ not necessarily the same length$)$ and are loaded with the same type of catalyst; however, Reactor $1$ is well$-$insulated and Reactor $2$ includes a heat exchange system that keeps the reactor temperature approximately isothermal.