   Chapter 5, Problem 69GQ

Chapter
Section
Textbook Problem

Use Appendix L to find the standard enthalpies of formation of oxygen atoms, oxygen molecules (O2), and ozone (O3). What is the standard state of oxygen? Is the formation of oxygen atoms from O2 exothermic? What is the enthalpy change for the formation of 1 mol of O3 from O2?

Interpretation Introduction

Interpretation:

The standard enthalpy of formation and standard state of oxygen atom and the nature of the reaction and the change in enthalpy of the formation have to be determined.

Concept Introduction:

The enthalpy changes for the formation of 1 mol of a compound directly from its component elements in their standard states. The most stable physical state for a substance at 1bar pressure and at a specified temperature.

Enthalpy change,ΔH, is the name given to the amount of heat evolved or absorbed in are carried out at constant pressure.

ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants)

Explanation

Given,

ΔfH(O)=249.17kJ/mol

ΔfH(O2)=0

ΔfH(O3)=142.67kJ/mol

The standard state of oxygen molecule is gas.

Substitute the values in ΔrH0=ΣnΔfH0(products)-ΣnΔfH0(reactants), as

ΔrH0=(2mol×249

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