   Chapter 5, Problem 83GQ

Chapter
Section
Textbook Problem

When heated to a high temperature, coke (mainly carbon, obtained by heating coal in the absence of air) and steam produce a mixture called water gas, which can be used as a fuel or as a starting place for other reactions. The equation for the production of water gas isC(s) + H2O(g) → CO(g) + H2 (g) (a) Use standard enthalpies of formation to determine the enthalpy change for this reaction. (b) Is the reaction exo- or endothermic? (c) What is the enthalpy change if 1000.0 kg (1 metric ton) of carbon is converted to water gas?

(a)

Interpretation Introduction

Interpretation:

The enthalpy change for the reaction using standard enthalpies 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(C)= 0 KJ/mol

ΔfH0(H2O)=-241.8kJ/mol

ΔfH0(CO)=-110.54kJ/mol

ΔfH0(H2)=0J/mol

Enthalpy change for the reaction

(b)

Interpretation Introduction

Interpretation:

The nature of the reaction has to be identified.

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)

(c)

Interpretation Introduction

Interpretation:

The enthalpy change if 1000.0kg of carbon converted to water gas has to be calculated.

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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