   Chapter 5, Problem 82GQ

Chapter
Section
Textbook Problem

Chloromethane, CH3Cl, a compound found throughout the environment, is formed in the reaction of chlorine atoms with methane.CH4(g) + 2 Cl(g) → CH3Cl(g) + HCl(g) (a) Calculate the enthalpy change for the reaction of CH4(g) and CI atoms to give CH3CI(g) and HCl(g). Is the reaction exo- or endothermic? (b) Draw an energy level diagram that shows how the various enthalpies in this problem are related.

(a)

Interpretation Introduction

Interpretation:

The enthalpy change of reaction of methane has 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,

ΔfH0(CH4)=-74.8kJ/mol

ΔfH0(Cl)=121kJ/mol

ΔfH0(CH3Cl)=-82.006kJ/mol

ΔfH0(HCl)=-92

(b)

Interpretation Introduction

Interpretation:

The energy diagram of the reaction has to be identified.

Concept Introduction:

Standard enthalpy of the reaction,ΔrHo, is the change in enthalpy that happens when matter is transformed by a given chemical reaction, when all reactants and products are in their standard states.

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

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