The overall reactions A --> D occurs via the following mechanism with the given reaction energies and barriers for each step  Assume that a single step controls the rate of the reaction and that any steps preceding the rate-determining step can be considered quasi-equilibrium. What are the values for apparent activation barriers you would measure for the following.   i) Step 1 is the rate-determining step.   ii) Step 2 is the rate-determining step.

Chemistry for Engineering Students
3rd Edition
ISBN:9781285199023
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
Section: Chapter Questions
Problem 11.61PAE
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The overall reactions A --> D occurs via the following mechanism with the given reaction energies and barriers for each step 

Assume that a single step controls the rate of the reaction and that any steps preceding the rate-determining step can be considered quasi-equilibrium. What are the values for apparent activation barriers you would measure for the following.

  i) Step 1 is the rate-determining step.

  ii) Step 2 is the rate-determining step.

(1)
(2)
A=B
B=C
(3) C D
AHrxn. 1 = -60 kJ mol-¹
AHrxn2 = +10 kJ mol-¹
AHxn3 = +15 kJ mol-¹
Eact,1 = 45 kJ mol-¹
Eact,2 = 30 kJ mol-¹
Eact,3 = 70 kJ mol-¹
Transcribed Image Text:(1) (2) A=B B=C (3) C D AHrxn. 1 = -60 kJ mol-¹ AHrxn2 = +10 kJ mol-¹ AHxn3 = +15 kJ mol-¹ Eact,1 = 45 kJ mol-¹ Eact,2 = 30 kJ mol-¹ Eact,3 = 70 kJ mol-¹
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