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Chapter 10, Problem 10.77QP

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CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

Solutions

Chapter
Section
FindFindarrow_forward

CHEMISTRY: ATOMS FIRST VOL 1 W/CON...

14th Edition
Burdge
ISBN: 9781259327933

(a)

Interpretation Introduction

Interpretation:

The standard enthalpy of formation and bond enthalpies has to be used to calculate the enthalpy of the reaction.

Concept Introduction:

Bond Enthalpy:

The measure of stability of molecule is bond enthalpy.  The change in enthalpy is related in breaking a specific bond of 1 mole of gaseous molecule. In solids and liquids bond enthalpies are affected by neighboring molecules.  There is possibility to predict the enthalpy of reaction using the average bond enthalpies.  Energy is always needed for the breaking of chemical bonds and release of energy always takes place with the formation of chemical bonds.  The enthalpy of reaction is estimated by counting the total number of broken bonds and bonds formed in a reaction.

The enthalpy of reaction in gas phase is given by,

ΔH°=BE(reactants)-BE(products)

Where,

BE= Bond enthalpy and = summation

To calculate: The enthalpy of the reaction from the bond enthalpy

(b)

Interpretation Introduction

Interpretation:

The standard enthalpy of formation and bond enthalpies has to be used to calculate the enthalpy of the reaction.

Concept Introduction:

Standard enthalpy of formation:

The change in enthalpy that is associated with the formation of one mole of a substance from its related elements being in standard state is called standard enthalpy of formation (ΔHf°).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

The standard enthalpy of reaction is the enthalpy of reaction that takes place under standard conditions.

The equation for determining the standard enthalpies of compound and element can be given by,

ΔH°reaction=nΔH°f(products)-mΔH°f(reactants)

To calculate: the enthalpy of the reaction from standard enthalpy of formation

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