KineticsIII

# KineticsIII - KINETICS II QUESTION 1 a Define the following...

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KINETICS II QUESTION 1 a) Define the following terms which relate to the reaction N 2 + 3H 2 2NH 3 i) the rate of reaction ii) the rate expression or rate law iii) the rate constant b) A gas phase reaction of the type 2A B is monitored at 298 K by measuring the total pressure (P t = P A + P B ). t / s 0 100 200 300 400 P t / Torr 400 322 288 268 256 Note that at t=0, the pressure is due to A only. i) Derive an expression which gives the pressure of A, P A , in terms of the total pressure P t . ii) Show that the data are consistent with a second order reaction. iii) Show that the rate constant at 298 K is k 2 = 8.06 x 10 -6 Torr -1 s -1 iv) If the rate constant at 37°C is k 2 = 1.73 x 10 -5 Torr -1 s -1 , show how to calculate the activation energy o f t h e r e a c t i o n . QUESTION 2 The kinetics of the thermal decomposition of ozone can be accounted for by the following mechanism: (1) O 3 O 2 + O k 1 (2) O + O 3 O 2 + O 2 k 2 (3) O + O 2 + M O 3 + M k 3 a) Show that the steady state concentration of oxygen atoms is given by [O] = k 1 [O 3 ] k 2 [O 3 ] + k 3 [O 2 ][M] b) Why is the species M included in both sides of reaction (3)? c)

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KineticsIII - KINETICS II QUESTION 1 a Define the following...

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