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Chemistry / Principles of General Chemistry 2 / Chapter 16 / Problem 75P

Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg

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At body temperature (37°C), k of an enzyme-catalyzed

Chapter 16, Problem 75P

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QUESTION:

Problem 75P

At body temperature (37°C), k of an enzyme-catalyzed reaction is 2.3 × 1014 times greater than k of the uncatalyzed reaction. Assuming that the frequency factor A is the same for both reactions, by how much does the enzyme lower the Ea ?

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QUESTION:

Problem 75P

At body temperature (37°C), k of an enzyme-catalyzed reaction is 2.3 × 1014 times greater than k of the uncatalyzed reaction. Assuming that the frequency factor A is the same for both reactions, by how much does the enzyme lower the Ea ?

ANSWER:

Solution 75P

Here we have to calculate how much does the enzyme lower the Ea .

Step 1

Temperature = 37°C = 273+37 = 310 K ,

Rate constant (k) enzyme-catalyzed reaction is 2.3 × 1014 times greater than k of the uncatalyzed reaction.

The frequency factor A is the same for both reactions

It is known that the Arrhenius equation is,

k = A ${e}^{-{E}_{a}\ /\ RT}$

Where k is the rate constant

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