At t $=0,$ a person spikes $47$ g of tracer

material into the first tank of a series of $8$

completely$-$mixed tanks. The total volume of

all of the tanks is $0\mathrm{.}17$ m$3$

$,$ and the $($steady$)$

flow rate through each tank is $60$ L$/$min$.$

What is the effluent concentration from the

last reactor at t $=2\mathrm{.}805$ min?