Consider the following balanced chemical equation:
H2O2 (aq) + 3 I-(aq) + 2 H+(aq) → I3- (aq) + 2 H2O (l)
In the first 48.6 seconds of the reaction, the concentration of I3- increased from 0.670 M to 0.987 M.
What is the average reaction rate over this time interval (in mol L-1 s-1)?