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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

The decomposition of NH3 to N2 and H2 was studied on two surfaces:

Surface Ea (kJ/mol)
W 163
Os 197

Without a catalyst, the activation energy is 335 kJ/mol.

a. Which surface is the better heterogeneous catalyst for the decomposition of NH3? Why?

b. How many times faster is the reaction at 298 K on the W surface compared with the reaction with no catalyst present? Assume that the frequency factor A is the same for each reaction.

c. The decomposition reaction on the two surfaces obeys a rate law of the form

Rate = k [ NH 3 ] [ H 2 ]

How can you explain the inverse dependence of the rate on the H2 concentration?

(a)

Interpretation Introduction

Interpretation: The activation energy of decomposition reaction of NH3 without and with catalyst is given. Based on these data answers are to be given.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

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

k=AeEaRT

To determine: The surface that is better heterogeneous catalyst for the decomposition of NH3 with proper explanation.

Explanation

Given

The activation energy with catalyst surface of W is 163kJ/mol .

The activation energy with catalyst surface of Os is 197kJ/mol .

The activation energy without catalyst surface is 335kJ/mol

(b)

Interpretation Introduction

Interpretation: The activation energy of decomposition reaction of NH3 without and with catalyst is given. Based on these data answers are to be given.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

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

k=AeEaRT

To determine: The comparison of rate of reaction with catalyst W and with no catalyst at 298K .

(c)

Interpretation Introduction

Interpretation: The activation energy of decomposition reaction of NH3 without and with catalyst is given. Based on these data answers are to be given.

Concept introduction: The substance that speeds up the rate of reaction without getting consumed itself in a chemical reaction is known as catalyst.

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

k=AeEaRT

To determine: The explanation that the rate of reaction is inversely dependent on the H2 concentration.

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