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Question 5 CHEMICAL KINETICS [19 marks] 5.1 The half-life of a first order reaction; AB is 100 seconds. How long does it take for the reactant concentration to decrease to 87% of its initial value? [6] 5.2 Consider the hypothetical second order reaction: 2B products. The reaction constant at 37 C and 87 C were determined experimentally to be 4.0 L.mol-1.5-1 and 8.0 L.mol-1.5-1 respectively (a) What is the activation energy for the reaction? (5) (b) How many times faster will the reaction occur at 87 C than at 37 C? (2) [7] 5.3 The rate law for the reaction, 201,0 - 2Cl2 + O2 at 200 C is found to be: rate = k[Cl2012 (a) How would the rate change if (Cl20) is reduced to one-third of its original value? (2) (b) How should the (CL20] be changed in order to double the rate? (2) (c) How would the rate change if (Cl20) is raised to threefold of its original value? (2) [6]