5. (12 pts) A company stores its liquid waste in open tanks on the grounds of its facility. The tanks are all 50 m long, 20 m wide and 5 m deep (but water level is at 4 m depth). One tank holds water with naphthalene (C10H8) dissolved in it. Naphthalene has a volatilization rate constant of 0.096 m/hr. If that tank functions as a batch reactor and volatilization is the only important loss mechanism for naphthalene, how long will it take for an initial concentration in the wastewater of 20mg/L to be reduced to 1mg/L ?