KineticsProbs09 - Kinetics problems Question 1 a) b) c)...

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Kinetics problems Question 1 a) Explain the terms order , overall order , and molecularity as applied to the kinetics of a chemical reaction. b) Outline one method by which the order of a chemical reaction can be determined experimentally. c) The gas phase reaction of fluorine atoms with bromine follows the stoichiometric equation F + B r 2 FBr + Br The following concentrations of Br 2 were observed as a function of time at 298 K when the initial fluorine atom concentration was [F] = 4x10 -9 mol dm -3 . time / ms 0 0.7 1.3 2.7 3.9 [ B r 2 ] / 10 -9 mol dm -3 0.100 0.066 0.048 0.022 0.011 i) Show that the reaction is first order with respect to Br 2 . ii) Given that the reaction is also first order with respect to F atoms, calculate the overall second- o r d e r r a t e c o n s t a n t . Question 2 a) Under what conditions can a reaction with rate law d[P] dt = k[A][B] 1/2 1+k'[A] be said to have a definite classification by order and molecularity? b) Deduce the relation between the rate constant and the half-life of a species for a first-order reaction. c) The following data were obtained for the concentration of product in a reaction of the form A P: t / s 10 20 40 60 80 [P] / mol L -1 0.90 1.13 1.29 1.35
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This note was uploaded on 05/09/2010 for the course CHE 3051 taught by Professor Sitimachmud during the Spring '08 term at National Central University.

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KineticsProbs09 - Kinetics problems Question 1 a) b) c)...

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