In order to study the photochemical decay of aqueous bromine in bright sunlight, a small quantity of liquid bromine was dissolved in water contained in a glass battery jar and placed in direct sunlight. The following data were obtained: Time (min) 10 30 20 1.74 40 0.88 2.45 50 0.62 ppm Br 1.23 60 0.44 a) Determine whether the reaction rate is zero-, first-, or second-order in bromine, and calculate the reaction rate constant in units of your choice. b) Assuming identical exposure conditions, calculate the required hourly rate of injection of bromine (in pounds) into a sunlit body of water 25,000 gal in volume in order to maintain a sterilizing level of bromine of 1.0 ppm. (Note: ppm parts of bromine per million parts brominated water by weight. In dilute aqueous solutions, 1 ppm=1 milligram per liter, molecular weight of Br = 80 Daltons.) 1 gal 3.785 liters 1 lb 454 gms