question_answer

The following results have been obtained during the kinetic studies of the reaction,

Experiment			Initial rate of formation of
	0.1 0.3 0.3 0.4	0.1 0.2 0.4 0.1

Determine the rate law and the rate constant for the reaction.                                                                                  [5] Or (a) With the help, of an example, explain what is meant by pseudo first order reaction?                                [2] (b) The rate of a reaction quadruples when the temperature changes from 293 K to 313 K. Calculate the energy of activation of the reaction assuming that it does not change with temperature.                             [3]  

Answer:

                                               ?(i)                                     ?(ii) On comparison, we get                                                                     [1] Then, Thus, Thus, rate law is From any experiment                                    [1] Or (a) Pseudo first order reaction Certain reactions which are biomolecular follow first order kinetics as concentration of one of the reactants is very high and does not change appreciably and also slow step (rate-determing step) involves only one reactant. Such types of reactions are called pseudo first order reactions. Examples (i) Hydrolysis of ester by acid Water is present in large excess and its concentration does not change and                                        [1] (ii)                                             [1] By slow step (b)                                                           Given,              Thus,                                                   [1] For energy of activation                                                  [1]