$(15$ points$)$ To remove the solution containing metal from a part after metal plating the part is

commonly rinsed with water. This rinse water is contaminated with metal and must be treated

before discharge. The Shiny Metal Plating Co$.$ uses the process flow diagram shown in the below

Figure. The plating solution contains $85\frac{g}{L}$ of nickel. The parts drag out $0\mathrm{.}05\frac{L}{m}in$ of plating

solution into the rinse tank. The flow of rinse water into the rinse tank is $150\frac{L}{m}in.$ Write the

general mass balance equation for the rinse tank and estimate the concentration of nickel in the

wastewater stream that must be treated. Assume that the rinse tank is completely mixed and that

no reactions take place in the rinse tank.