QUESTION 1 [25 total marks; workings are required] A reaction follows this mechanism: (1) A+B=C (2) CD Step (1) can be considered as a pre-equilibrium with activation energies for the forward and reverse reactions of 21 kJ mol and 32 kJ molt respectively. Step (2) has an activation energy of 14 kJ moli. (a) What is the activation energy of this composite reaction? (5 marks) (b) Briefly, comment on your result for this activation energy. (2 marks) (c) What is the likely effect of temperature on the composite rate of the formation of D? (2 marks) (d) Describe how this reaction might respond to increasing temperature in the presence of a catalyst? (2 marks) (e) When a catalyst was used, and the reaction was performed at 30 C and atmospheric pressure, the observed rate constant was measured as 2.00 x 103 mol' dm's! (i) If the concentration of both A and B is 1.35 mol dm at the beginning of the reaction, how long does it take for the concentration of D to reach 0.9 mol dm? (6 marks)