I. Glutamic acid $(C_5{H}_6{O}_4(N))$ is used as one of the reagents for a standard to check the BOD test. Determine the total theoretical oxygen demand of $63m\frac{g}{L}$ of glutamic acid. Assume the following reactions apply:

Molecular weight: $C_5{H}_9{O}_{4}N=147$

$C_5{H}_9{O}_{4}N+4\mathrm{.}5O_2$harr$5C{O}_2+3H_{2}O+N{H}_3$

$N{H}_3+2O_{2}harrN{O}_3+H^{+}+H_{2}O$

A storm sewer is carrying snow melt containing $1\mathrm{.}7\frac{g}{L}$ of sodium chloride into a small stream. The stream has a naturally occurring sodium chloride concentration of $12m\frac{g}{L}.$ If the storm sewer flow rate is $2000\frac{L}{m}in$ and the stream flow rate is $2\mathrm{.}5\frac{m^3}{s},$ what is the concentration of salt in the stream after the discharge point $(m\frac{g}{L})?$

Assume that the sewer flow and the stream flow are completely mixed, that the salt is a conservative substance, and that the system is at steady state.

$>$ Reaction Rate $=0$ jore

A CSTR is to be designed to remove contaminant A from water with a steady state efficiency of $95\%.$ The decay reaction is first order, with a rate constant of $0\mathrm{.}1h^{-1}.$ The inlet concentration of $A$ is $0\mathrm{.}5M.$ What hydraulic detention time $()$ is required to achieve the desired efficiency? Derive the first order decay equation that describes the change in contaminant concentration to solve this problem.