Chapter 6, Problem 6.50P

(a)

Interpretation Introduction

Interpretation:Changes needed in the following reaction to make the enthalpy change equal to $\Delta H^0{}_{\text{f}}$ for the compound are to be made.

  $\text{Cl(}g\text{)+Na(}s\text{)}\to \text{NaCl(}s\text{)}$

Concept Introduction : Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is the difference between the sum of standard heat of formation of products and reactants. Standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ of any element at standard states is zero. Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is equals to standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ when reaction is formation reaction that is formation of one mole of compound takes place from corresponding elements are at standard states.

(b)

Interpretation Introduction

Interpretation:Changes needed in the following reaction to make the enthalpy change equal to $\Delta H^0{}_{\text{f}}$ for the compound are to be made.

  ${\text{H}}_{\text{2}}\text{O(}g\text{)}\to 2\text{H(}g\text{)+}\frac{1}{2}{\text{O}}_{\text{2}}(g)$

Concept Introduction : Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is the difference between the sum of standard heat of formation of products and reactants. Standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ of any element at standard states is zero. Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is equals to standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ when reaction is formation reaction that is formation of one mole of compound takes place from corresponding elements are at standard states.

(c)

Interpretation Introduction

Interpretation:Changes needed in the following reaction to make the enthalpy change equal to $\Delta H^0{}_{\text{f}}$ for the compound are to be made.

Concept Introduction : Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is the difference between the sum of standard heat of formation of products and reactants. Standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ of any element at standard states is zero. Standard heat of reaction $\left(\Delta H^0{}_{\text{rxn}}\right)$ is equals to standard heat of formation $\left(\Delta H^0{}_{\text{f}}\right)$ when reaction is formation reaction that is formation of one mole of compound takes place from corresponding elements are at standard states.