Chapter 10, Problem 10.123QP

a)

Interpretation Introduction

Interpretation: Those reactions having similar values of ${\text{ΔH°}}_{\text{reaction}}\text{\&}{\text{ΔH°}}_{\text{f}}$ have to be identified.

Concept Introduction:

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  (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Answer to Problem 10.123QP

Since, more than one mole of substance is formed ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

Explanation of Solution

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 (${\text{ΔH°}}_{\text{f}}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Since, more than one mole of substance is formed ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

b)

Interpretation Introduction

Interpretation: Those reactions having similar values of ${\text{ΔH°}}_{\text{reaction}}\text{\&}{\text{ΔH°}}_{\text{f}}$ have to be identified.

Concept Introduction:

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  (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Answer to Problem 10.123QP

Since, more than one mole of substance is formed ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

Explanation of Solution

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 (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Since, more than one mole of substance is formed ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

c)

Interpretation Introduction

Interpretation: Those reactions having similar values of ${\text{ΔH°}}_{\text{reaction}}\text{\&}{\text{ΔH°}}_{\text{f}}$ have to be identified.

Concept Introduction:

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  (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Answer to Problem 10.123QP

The formation of one mole of a substance from its related elements makes them being in standard state, therefore ${\text{ΔH°}}_{\text{reaction}}$ has same value of ${\text{ΔH°}}_{\text{f}}$.

Explanation of Solution

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 (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

The formation of one mole of a substance from its related elements makes them being in standard state, therefore ${\text{ΔH°}}_{\text{reaction}}$ has same value of ${\text{ΔH}}_{\text{f}}\text{°}$.

d)

Interpretation Introduction

Interpretation: Those reactions having similar values of ${\text{ΔH°}}_{\text{reaction}}\text{\&}{\text{ΔH°}}_{\text{f}}$ have to be identified.

Concept Introduction:

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  (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Answer to Problem 10.123QP

Since, ${\text{Cu}}^{\text{2+}}{}_{\left(\text{aq}\right)}$ is not standard state of Copper and ${\text{SO}}_{\text{4}}{}^{\text{2-}}$ is not a element ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

Explanation of Solution

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 (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Since, ${\text{Cu}}^{\text{2+}}{}_{\left(\text{aq}\right)}$ is not standard state of Copper and ${\text{SO}}_{\text{4}}{}^{\text{2-}}$ is not a element ${\text{ΔH°}}_{\text{reaction}}$ is not the same with ${\text{ΔH°}}_{\text{f}}$ value.

e)

Interpretation Introduction

Interpretation: Those reactions having similar values of ${\text{ΔH°}}_{\text{reaction}}\text{\&}{\text{ΔH°}}_{\text{f}}$ have to be identified.

Concept Introduction:

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  (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

Answer to Problem 10.123QP

The formation of one mole of a substance from its related elements makes them being in standard state, therefore ${\text{ΔH°}}_{\text{reaction}}$ has same value of ${\text{ΔH°}}_{\text{f}}$.

Explanation of Solution

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 (${\text{ΔH}}_{\text{f}}\text{°}$).  The standard enthalpy of formation is used to determine the standard enthalpies of compound and element.

The formation of one mole of a substance from its related elements makes them being in standard state, therefore ${\text{ΔH°}}_{\text{reaction}}$ has same value of ${\text{ΔH}}_{\text{f}}\text{°}$