3- For the reaction 2A + B + 3C -> D +3 E the experimental data yield the rate of R= K [A]? [B] [C]. What is the overall order of the reaction? 4- It has been experimentally determined that the rate law for the reaction between mercury (II) chloride and sodium oxalate is third-order overall and first-order with respect to HgCl2. Write the rate law for this equation. 2HgCl, + NazC204 - 2NaCI + 2CO, + HgzClz