Problem 3A 2,000 m3 water tower has been taken out of operation to install a chlorine monitor. When the watertower was put out of operation, its chlorine concentration was 2.0 mg/L. After ten hours, the chlorinecontent was determined to be 1.2 mg/L. Considering that the tank is a completely mixed batch reactor andthat there is a first order decay.a) Calculate the reaction decay rate in day-1.b) What mass of chlorine (in kg) must be added to the tank to raise the chlorine level back to itsoriginal concentration?