   Chapter 5, Problem 61PS

Chapter
Section
Textbook Problem

The standard enthalpy of formation of solid barium oxide, BaO, is –553.5 kJ/mol, and the standard enthalpy of formation of barium peroxide, BaO2, is –634.3 kJ/mol.(a) Calculate the standard enthalpy change for the following reaction. Is the reaction exothermic or endothermic?2 BaO2(s) → 2 BaO(s) + O2(g)(b) Draw an energy level diagram that shows the relationship between the enthalpy change of the decomposition of BaO2, to BaO and O2, and the enthalpies of formation of BaO2(s) and BaO2(s).

(a)

Interpretation Introduction

Interpretation:

The standard enthalpy 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

Given Δf for BaO is=- 553.5 kJ/mol

Δf for BaO2=-634.3 kJ/mol

This equation can be seen as the summation of the two equations:

(1)2Ba+O22BaO, Equation (1) corresponds to the formation of BaO when multiplied by 2

(2)2BaO2

(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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