Answer Happy

5.1 The half-life of a first order reaction; A → B 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.s-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, 2 C1,0 - 2 Cl2 +0, at 200 °C is found to be: rate = , k[Cl2012 (a) How would the rate change if [Clz0] is reduced to one-third of its original value? (2) (b) How should the [C4,0] be changed in order to double the rate? (2) (c) How would the rate change if [C40] is raised to threefold of its original value? (2) [6]