The activation energy and Δ E for a reaction is given. By using these values, the activation energy for the given reverse reaction is to be calculated. Concept introduction: A certain threshold energy which is necessary for the reaction to occur is called activation energy. The relationship between the rate constant and activation energy is given by the Arrhenius equation, k = A e − E a R T The change in energy ( Δ E ) is the energy difference between reactant and product. The value of Δ E is either positive or negative. To determine : The activation energy for the given reverse reaction.

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Chapter 11, Problem 65E

Interpretation Introduction

Interpretation: The activation energy and ΔE for a reaction is given. By using these values, the activation energy for the given reverse reaction is to be calculated.

Concept introduction: A certain threshold energy which is necessary for the reaction to occur is called activation energy.

The relationship between the rate constant and activation energy is given by the Arrhenius equation,

k=Ae−EaRT

The change in energy (ΔE) is the energy difference between reactant and product. The value of ΔE is either positive or negative.

To determine: The activation energy for the given reverse reaction.

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Consider these three reactions as the elementary steps in the mechanism for a chemical reaction.(i) Cl2 (g) + Pt (s) à 2Cl (g) + Pt (s) Ea = 1550 kJ ∆H = – 950 kJ(ii) Cl (g)+ CO (g) + Pt (s) à ClCO (g) + Pt (s) Ea = 2240 kJ ∆H = 575 kJ(iii) Cl (g) + ClCO (g) à Cl2CO (g) Ea = 2350 kJ ∆H = – 825 kJ e. Which reaction intermediate would be considered a catalyst (if any) and why?f. If you were to add 2700kJ of activation energy to the reaction, would you be able to make thereaction reverse itself (i.e. have the products become reactants)? Justify your answer.g. If you were to added a positive catalyst to step (iii) what would the end result be? Justify yourprediction. h. Your friend is looking at your graph and states that she believes that step (ii) is the ratedetermining step. Do you agree with her? Justify your reasoning.