4. For the reaction 2A+B22AB, the following information was obtained: Trial 1 2345 Initial Rate (M/s) [A] (M) 1.5 [B2] (M) 2.0 0.183 4.0 3.0 1.098 3.0 4.5 1.863 1.5 4.0 0.732 4.5 2.0 0.549 a) Determine the rate law and calculate the value of constant. You must justify your answers. b) Determine which of the below mechanism seems to match the rate law you determined in part (a) best. Explain. 1: A+ B AB+B A+B AB Slow Fast ii. B+B2 A+B B+ B Fast AB + B Slow A+BAB Fast iii. A+B2AB+B Fast A+B AB Slow c) For each participant in the mechanism you chose for part (b), decide what role it plays in the reaction (i.e. is it a catalyst, product, reactant, intermediate). Some species may play multiple roles.