1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 Potential Energy (kJ) 600 400 200 0 -200- -400 -600- -800 (i) Cl₂ (g) + Pt(s) → 2Cl (g) + Pt(s) (ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s) Ea = 1550 kJ Ea = 2240 kJ (iii) Cl (g) + CICO (g) → Cl₂CO (g) Ea = 2350 kJ AH=-950 kJ ΔΗ = 575 ΚΙ AH=-825 kJ a. Draw the potential energy diagram for the reaction. Label the data points for clarity. The potential energy of the reactants is 600 kJ Reaction Progress b. What is the overall chemical equation? c. What is the overall change in enthalpy for the above chemical reaction? d. What is the overall amount of activation energy for the above chemical reaction? e. Which reaction intermediate would be considered a catalyst (if any) and why? f. If you were to add 2700kJ of energy to the reaction (e.g. 2700 kl of heat or electricity), would you be able to make the reaction reverse itself (i.e. have the products become reactants)? Justify your answer. g. If you were to added a positive catalyst to step (ii) what would the end result be? Explain your prediction. h. Your friend is looking at your graph and states that she believes that step (ii) is the rate determining step. Do you agree with her? If you do not agree with her, what step would you pick as the RDS?
1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction. 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 Potential Energy (kJ) 600 400 200 0 -200- -400 -600- -800 (i) Cl₂ (g) + Pt(s) → 2Cl (g) + Pt(s) (ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s) Ea = 1550 kJ Ea = 2240 kJ (iii) Cl (g) + CICO (g) → Cl₂CO (g) Ea = 2350 kJ AH=-950 kJ ΔΗ = 575 ΚΙ AH=-825 kJ a. Draw the potential energy diagram for the reaction. Label the data points for clarity. The potential energy of the reactants is 600 kJ Reaction Progress b. What is the overall chemical equation? c. What is the overall change in enthalpy for the above chemical reaction? d. What is the overall amount of activation energy for the above chemical reaction? e. Which reaction intermediate would be considered a catalyst (if any) and why? f. If you were to add 2700kJ of energy to the reaction (e.g. 2700 kl of heat or electricity), would you be able to make the reaction reverse itself (i.e. have the products become reactants)? Justify your answer. g. If you were to added a positive catalyst to step (ii) what would the end result be? Explain your prediction. h. Your friend is looking at your graph and states that she believes that step (ii) is the rate determining step. Do you agree with her? If you do not agree with her, what step would you pick as the RDS?
Chemistry for Engineering Students
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ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter11: Chemical Kinetics
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Transcribed Image Text:1. Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.
2600
2400
2200
2000
1800
1600
1400
1200
1000
800
Potential Energy (kJ)
600
400
200
0
-200-
-400
-600-
-800
(i) Cl₂ (g) + Pt(s) → 2Cl (g) + Pt(s)
(ii) Cl (g)+ CO (g) + Pt (s) → CICO (g) + Pt (s)
Ea = 1550 kJ
Ea = 2240 kJ
(iii) Cl (g) + CICO (g) → Cl₂CO (g)
Ea
= 2350 kJ
AH=-950 kJ
ΔΗ = 575 ΚΙ
AH=-825 kJ
a. Draw the potential energy diagram for the reaction. Label the data points for clarity.
The potential energy of the reactants is 600 kJ
Reaction Progress
b. What is the overall chemical equation?
c. What is the overall change in enthalpy for the above chemical reaction?
d. What is the overall amount of activation energy for the above chemical reaction?
e. Which reaction intermediate would be considered a catalyst (if any) and why?
f. If you were to add 2700kJ of energy to the reaction (e.g. 2700 kl of heat or electricity), would
you be able to make the reaction reverse itself (i.e. have the products become reactants)?
Justify your answer.
g. If you were to added a positive catalyst to step (ii) what would the end result be? Explain your
prediction.
h. Your friend is looking at your graph and states that she believes that step (ii) is the rate
determining step. Do you agree with her? If you do not agree with her, what step would you
pick as the RDS?
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