Chemistry In Context
Chemistry In Context
9th Edition
ISBN: 9781259638145
Author: Fahlman, Bradley D., Purvis-roberts, Kathleen, Kirk, John S., Bentley, Anne K., Daubenmire, Patrick L., ELLIS, Jamie P., Mury, Michael T., American Chemical Society
Publisher: Mcgraw-hill Education,
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Chapter 5, Problem 49Q

(a)

Interpretation Introduction

Interpretation:

Heat evolved by the given reaction at given condition has to be determined.

Concept introduction:

Bond dissociation enthalpy:

Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.

ΔrH=ΔH(bondsbroken)ΔH(bondsformed)

Enthalpy of formation:

ΔrH=ΔfH0(products)ΔfH0(reactants)

(a)

Expert Solution
Check Mark

Explanation of Solution

Given data:

nCO+(2n+1)H2CnH2n+2+nH2O

The balanced equation when n=1 is given below:

CO+3H2CH4+H2O

Bonds broken:

  1molCObond=1(1073kJ)=1073kJ3molHHbond=3(436kJ)=1308kJTotalenergyabsorbed=1(1073kJ)=2381kJ

Bonds formed:

  4molC-Hbond=4(416kJ)=1664kJ2molO-Hbond=2(467kJ)=934kJTotalenergyreleased=2598kJ

The total energy change is given below:

  (+2381kJ)+(-2598kJ)=-217kJ

(b)

Interpretation Introduction

Interpretation:

Reason for having more or less energy is given off per mole in the formation of larger hydrocarbons has to be given without doing any calculation.

Concept introduction:

Bond dissociation enthalpy:

Bond energy or more correctly the bond dissociation enthalpy is the enthalpy change when breaking a bond in a molecule with the reactant and products in the gas phase.

ΔrH=ΔH(bondsbroken)ΔH(bondsformed)

Enthalpy of formation:

ΔrH=ΔfH0(products)ΔfH0(reactants)

(b)

Expert Solution
Check Mark

Explanation of Solution

Given data:

nCO+(2n+1)H2CnH2n+2+nH2O

The balanced equation when n=1 is given below:

CO+3H2CH4+H2O

The given reaction is nCO+(2n+1)H2CnH2n+2+nH2O.

From the equation it is clear that there will always be n CO triple bonds to break (2n+1)HH to break. Also, the number of C-H bond forming will be (2n+2) and the number of O-H bond will be 2n and also the number of C-C bond forming will be n-1.

By combining all these terms, it is clear that as n becomes larger, more and more energy will be released.

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Chapter 5 Solutions

Chemistry In Context

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