Question $-3$:

An $750000$m$^(3)$ lagoon with $250$ ppm of $($CaCl$\_(2))$ and flowing by $10\mathrm{.}0($m$^(3))/($sec$).$ A

tributary feeding carrying $3100$m$($g$)/($L$)$ of $($CaCl$\_(2))$ discharges into it$,$ with flow rate

$800($m$^(3))/()$ day. Treating salt as non$-$conservative substance. Note that $($CaCl$\_(2))$

concentration just downstream the junction is $200$ ppm $,$ and reaction rate constant

equal to $(-0\mathrm{.}2()/($day$)).$ Classify $($with reason$)$ the mixing conditions in the lagoon

$($completely or poor$).$ in $($m$^3/$hr$)$