$(-)(15$ pts$)$ Benzene $(C_6{H}_6)$ is a hazardous substance that has been detected at high concentrations in the air around petroleum refineries in the Houston area. There were an estimated $714$ tons$/$year of benzene emitted from chemical processes in the Houston area, i$.$e$.,$ a daily average mass emissions of $1\mathrm{.}96$ tons $($Frey & Zhao, $2004).$ Presume that during one summer day, the $1\mathrm{.}96$ tons of benzene disperses throughout a rectangular volume of air around the refineries with an area of $5km5km$ and a height of $1\mathrm{.}5$ km $.$ Determine the concentration of benzene in $\frac{g}{m^3}$ and in $pp{m}_v.$ For converting tons to other units, use $1$ ton $=2000lb.$ Assume a summer temperature of $40C$ and an atmospheric pressure of $1$ atm $.$