And then you can check the two and see if they coincide. And usually for the most part they will coincide. So this is a second way that you could find rate laws in complex reactions by using the rate law for the slow step, the rate determining step. So since this is a bimolecular elementary reaction we can use the coefficients as the exponents. In other words, our rate of reaction is equal to KR rate constant times the concentration of hydrogen peroxide times the concentration of iodine. And each of the exponents is one because we have 1 mol of this guy and 1 mol of this guy react to produce these two intermediates.