   Chapter 5, Problem 62PS

Chapter
Section
Textbook Problem

An important step in the production of sulfuric acid is the oxidation of SO2 to SO3.SO2(g) + ½ O2(g) → SO3(g)Formation of SO3 from the air pollutant SO2 is also a key step in the formation of acid rain. (a) Use standard enthalpies of formation to calculate the enthalpy change for the reaction. Is the reaction exothermic or endothermic? (b) Draw an energy level diagram that shows the relationship between the enthalpy change for the oxidation of SO2 to SO3 and the enthalpies of formation of SO3(g) and SO3(g).

(a)

Interpretation Introduction

Interpretation:

The enthalpy change of reaction and the nature of the reaction have to be determined.

Concept Introduction:

The standard enthalpy of formation is the enthalpy change for the formation of 1mol of the compound directly from its component elements in their standard states.

Enthalpy change for the reaction ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

Explanation

Consider these equations

(1)SO2S+O2            ΔfH0=297kJ

(2)S+3/2O2SO3            ΔfH0=-396kJ

Add the above equation to get the required equation

(b)

Interpretation Introduction

Interpretation:

The energy level diagram which represents the relation between enthalpy change and enthalpies of formation has to be depicted.

Concept Introduction:

The standard enthalpy of formation is the enthalpy change for the formation of 1mol of the compound directly from its component elements in their standard states.

Enthalpy change for the reaction ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

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