Hydrogen sulfide () is a common and troublesome pollutant in industrial wastewaters. One way to remove is to treat the water with chlorine, in which case the following reaction occurs: The rate of this reaction is first order in each reactant. The rate constant for the disappearance of at 28 is . If at a given time the concentration of is 2.0×10?4 and that of is 4.8×10?2 , what is the rate of formation of ?