9th Edition
Steven S. Zumdahl
ISBN: 9781133611097




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

The activation energy for some reaction

X 2 ( g ) + Y 2 ( g ) 2 XY ( g )

is 167 kJ/mol, and ∆E for the reaction is + 28 kJ/mol. What is the activation energy for the decomposition of XY?

Interpretation Introduction

Interpretation: The activation energy and ΔE is given for the formation of 2XY . By using these values, the activation energy for the decomposition of XY is to be determined.

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,


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 decomposition of XY .



The activation energy of given forward reaction is 167kJ/mol .

The change in energy ΔE for forward reaction is 28kJ/mol .

The given reaction is,

X2(g)+Y2(g)2XY(g) .

It is a forward reaction.

The reaction of decomposition of XY is,


It is a backward reaction.


The change in energy is calculated by using the formula,



  • ΔE is change in energy.
  • Ea(forward) is activation energy of forward reaction

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