3. Assuming the reaction took 75 seconds, calculate the relative rate of reaction 1000/t 4. A student repeated the experiment and mixed the following reactants 10.0 mL of 0.10 M KI, 10.0 mL of 0.0010 M Na2S2O3, 10.0 mL of 0.040 M KBrO3, 10.0 mL of 0.10 M HCl and 10 mL of H2O. It took 155 seconds for the mixture to turn blue. Calculate concentrations of each reactant in the