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Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097

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BuyFindarrow_forward

Chemistry

9th Edition
Steven S. Zumdahl
ISBN: 9781133611097
Textbook Problem

One mechanism for the destruction of ozone in the upper atmosphere is

Chapter 12, Problem 75AE, One mechanism for the destruction of ozone in the upper atmosphere is a. Which species is a

a. Which species is a catalyst?

b. Which species is an intermediate?

c. Ea for the uncatalyzed reaction

O 3 ( g ) + O ( g ) 2 O 2 ( g )

is 14.0 kJ. Ea. for the same reaction when catalyzed is 11.9 kJ. What is the ratio of the rate constant for the catalyzed reaction to that for the uncatalyzed reaction at 25°C? Assume that the frequency factor A is the same for each reaction.

(a)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere is given. The intermediate and catalyst in the proposed mechanism are to be identified. The activation energy of uncatalyzed and catalyzed reaction is given. The rate constant ratio of catalyzed to uncatalyzed reaction for the given temperature is to be calculated.

Concept introduction: The energy difference between activated complex and reactants is known as activation energy. The relationship between the rate of reaction and activation energy is given by the Arrhenius equation,

k=AeEaRT

To determine: The catalyst in the mechanism of a destruction of ozone in upper atmosphere.

Explanation

The mechanism for the destruction of ozone is,

O3(g)+NO(g)NO2(g)+O2(g)SlowNO2(g)+O(g)NO(g)+O

(b)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere is given. The intermediate and catalyst in the proposed mechanism are to be identified. The activation energy of uncatalyzed and catalyzed reaction is given. The rate constant ratio of catalyzed to uncatalyzed reaction for the given temperature is to be calculated.

Concept introduction: The energy difference between activated complex and reactants is known as activation energy. The relationship between the rate of reaction and activation energy is given by the Arrhenius equation,

k=AeEaRT

To determine: The intermediate in the mechanism of destruction of ozone in upper atmosphere.

(c)

Interpretation Introduction

Interpretation: A proposed mechanism of a destruction of ozone in upper atmosphere is given. The intermediate and catalyst in the proposed mechanism are to be identified. The activation energy of uncatalyzed and catalyzed reaction is given. The rate constant ratio of catalyzed to uncatalyzed reaction for the given temperature is to be calculated.

Concept introduction: The energy difference between activated complex and reactants is known as activation energy. The relationship between the rate of reaction and activation energy is given by the Arrhenius equation,

k=AeEaRT

To determine: The rate constant ratio of catalyzed to uncatalyzed reaction at 25oC temperature

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