The rate of a certain reaction was studied at various temperatures. The table sh

Question

The rate of a certain reaction was studied at various temperatures. The table shows te constant (k) data collected during the experiments. Plot the data, and then answer the following questions (T) and rate T (K)k (s) 400 420 440 What is value of the activation energy, Ea, for this reaction? 0.000278 0.00189 0.0108 0.0532 0.229 0.878 3.03 9.56 27.8 74.9 Number kJ mol 480 500 520 540 560 580 What is the value of the pre-exponential factor (sometimes called the frequency factor), A, for this reaction? Number

Explanation / Answer

ln(K2/K1) = E/R(1/T1- 1/T2)

ln(0.00189/0.000289) = E/8.314(1/400 - 1/420)

E = 133.95 KJ.

K = Ae-E/RT

0.000278 = A e-133950/8.314×400

A= 7.09×1013 s-1

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