Problem #$4$: Dispersed plug flow through a long narrow

chlorination tank was analyzed by injecting a pulse input of a

dye tracer in the influent. The tracer's response curve was

measured in the effluent and the measured time and chorine

concentration values are listed in the table at the right. The

theoretical residence time of the reactor is $50$min. Calculate $($a$)$

the actual mean residence time of the reactor, $($b$)$ the variance,

and $($c$)$ the number of CSTRs in series that is needed to represent

the degree of dispersion and mixing in the reactor, $($d$)$ If we were

to treat an influent water containing $10\frac{g}{L}$ of diatrizoate using

the catalytic dehydrodehalogenation process described in

problem #$1$ in this reactor with the same rate constant

determined in problem #$1,$ what would be the expected effluent

chromium concentration.