Answered: Temperature effect on the degradation…

Chemistry: The Molecular Science

5th Edition

ISBN:9781285199047

Author:John W. Moore, Conrad L. Stanitski

Publisher:John W. Moore, Conrad L. Stanitski

Chapter11: Chemical Kinetics: Rates Of Reactions

Section: Chapter Questions

Problem 25QRT

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Question

Temperature effect on the degradation of a multisulfa preparation was evaluated at 60 and 70 C. If the
first-order reaction rate constants responsible for the degradation at these two temperatures were 8.2 x
10-4 and 1.96 x 10-3 hr-1, respectively, answer the following TWO questions.

6. Calculate the activation energy, Ea, for this drug in this temperature range (in kcal/mol).
(The gas constant; R = 1.987 cal/deg mol)

ln (k2/k1) = Ea/R (T2 – T1) / (T2 x T1)
ln (0.00196/0.00082) = Ea/1.987 (343 – 333) / (343 x 333)
Ea = 19,777 cal/mol ~19.8 kcal/mol

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