A)Explain three methods for determining the rate law.
B)The data for determining 2A ?A2? of a certain reaction in ethanol solution at 40oC is as follows:
(A)moldm-3 × 10-3 68 50.2 40.3 33.1 28.4 22.3 18.7 14.5
(t)/Min 0 40 80 120 160 240 300 420
Using half life method , determine the reaction order.
C) (i) Explain A and Ea factors in the Arrhenius equation.(2mrks)
Question three A)Consider the reaction
A?B.
The rate of reaction is 1.6 × 10-2 M/s when the concentration of A is 0.35M. Calculate the rate constant if the reaction is
i)first order in A(2mrks)
ii)second order in A(2mrks)
B)(i) Define half-life (1/2)
(ii) write the equation relating the half life of a first –order reaction to the rate constant.(4mrks)
(iii)for a first-order reaction , how long will it take for the concentration of reaction to fall to one-eight its original value?(write your answer in terms of K)
(C) Variation of the rate constant with temperature for the first order reaction
2N2O5(g)? 2N2O4(g) + O2(g)
Is given in the following table. Determine graphically the activation energy for the reaction.(8mrks)
T(K) K(s-1)
298 1.74× 10-5
308 6.61× 10-5
318 2.51 ×10-4
328 7.59 × 10-4
338 2.40 × 10-3
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