For the process shown in the figure. the total conversion of benzene is $90\%$ and the single pass conversion through the reactor is $25\%.$ Assume that in the fresh feed f$,1\mathrm{.}5$ moles of hydrogen are fed per mole of nitrobenzene, and that the composition of the circulation stream is $23$ mol$\%$ nitrobenzene and $77$ mol$\%$ hydrogen.

A$)$ Calculate all mass fluxes and compositions of all streams.

B$)$ Determine the degree of progress of the reaction.

C$)$ Determine the heat required in the reactor in kW$.$