Answered: The enzyme urease catalyzes the…

Chemistry & Chemical Reactivity

10th Edition

ISBN:9781337399074

Author:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Publisher:John C. Kotz, Paul M. Treichel, John Townsend, David Treichel

Chapter14: Chemical Kinetics: The Rates Of Chemical Reactions

Section: Chapter Questions

Problem 72GQ: Hundreds of different reactions occur in the stratosphere, among them reactions that destroy the...

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Question

The enzyme urease catalyzes the reaction of urea,
(NH₂CONH₂), with water to produce carbon dioxide and
ammonia. In water, without the enzyme, the reaction proceeds
with a first-order rate constant of 4.15 x 10^-5 s^-1 at
100 °C. In the presence of the enzyme in water, the reaction
proceeds with a rate constant of 3.4 x 10⁴ s^-1 at 21 °C.
(a) Write out the balanced equation for the reaction catalyzed
by urease. (b) If the rate of the catalyzed reaction were
the same at 100 °C as it is at 21 °C, what would be the difference
in the activation energy between the catalyzed and
uncatalyzed reactions? (c) In actuality, what would you expect
for the rate of the catalyzed reaction at 100 °C as compared
to that at 21 °C? (d) On the basis of parts (c) and (d),
what can you conclude about the difference in activation
energies for the catalyzed and uncatalyzed reactions?

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