Suppose there is a river that has a flow rate of 3.00 m/s with negligible concentration of sodium chloride and a stream discharges into this river at a flow rate of 0.05 m/s. The concentration of sodium chloride of the out flow after mixing is to be 1.0 mg/L. 1. What should be the inflow concentration of sodium chloride in the stream to maintain a steady state condition? Consider a completely mixed system. 2. Calculate the mass rate (kg/d) of the sodium chloride in the stream?