21. A reaction proceeds by a series of elementary steps as shown below. The activation energy and heat of reaction are shown for each step. Step No. 1 2 3 Elementary step A + B₂ → AB2 AB₂ + ABC + BC ABC + B2 → AB2 + BC a) What is the overall equation for this reaction? b) What is the heat of reaction for the overall equation? c) Which is the rate determining step? Activation energy 8 kJ/mol 15 kJ/mol 20 kJ/mol Enthalpy of reaction -5 kJ/mol +2.6 kJ/mol -3.9 kJ/mol d) Draw an energy profile for the overall reaction showing the enthalpies of each step, the overall enthalpy as well as the activation energies of each step.
21. A reaction proceeds by a series of elementary steps as shown below. The activation energy and heat of reaction are shown for each step. Step No. 1 2 3 Elementary step A + B₂ → AB2 AB₂ + ABC + BC ABC + B2 → AB2 + BC a) What is the overall equation for this reaction? b) What is the heat of reaction for the overall equation? c) Which is the rate determining step? Activation energy 8 kJ/mol 15 kJ/mol 20 kJ/mol Enthalpy of reaction -5 kJ/mol +2.6 kJ/mol -3.9 kJ/mol d) Draw an energy profile for the overall reaction showing the enthalpies of each step, the overall enthalpy as well as the activation energies of each step.
Chemistry
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ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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Transcribed Image Text:21. A reaction proceeds by a series of elementary steps as shown below. The activation energy and
heat of reaction are shown for each step.
Step No.
1
2
3
Elementary step
A + B₂ → AB2
AB₂ +
ABC + BC
ABC + B2 → AB2 + BC
a) What is the overall equation for this reaction?
b) What is the heat of reaction for the overall equation?
c) Which is the rate determining step?
Activation energy
8 kJ/mol
15 kJ/mol
20 kJ/mol
Enthalpy of
reaction
-5 kJ/mol
+2.6 kJ/mol
-3.9 kJ/mol
d) Draw an energy profile for the overall reaction showing the enthalpies of each step, the overall
enthalpy as well as the activation energies of each step.
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