4.The formation of C2H;CI(g) is an exothermic reaction (AH° = –72.6 kJ/molpxn). Thefollowing two step reaction mechanism is proposed: Step 1:C,H4(g) + HCI(g) → C,H;*(g) + C-(g)Slow step Step 2:

C,H;*(g) + Cl-(g) → C;H;CI(g)Fast step A.) Write the rate law for the reaction that is consistent with the reaction mechanism above. B.) Identify an intermediate in the reaction mechanism above. Using the axes provided, draw a curve that shows energy changes that occur during the progress of the reaction. The curve should illustrate both proposed two-step mechanisms and the enthalpy change of the reaction.