Chapter 4, Problem 4.19NP

(a)

Interpretation Introduction

Interpretation:

The standard enthalpy change for the biosynthetic fixation of nitrogen should be calculated at 298 K temperature.

  ${\text{N}}_{\text{2}}{\text{(g)+3H}}_{\text{2}}\text{O(l)}\to {\text{2NH}}_{\text{3}}\text{(aq)+}\frac{\text{3}}{\text{2}}{\text{O}}_{\text{2}}\text{(g)}$

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.

(b)

Interpretation Introduction

Interpretation:

The standard enthalpy change for the preparation of glycine from ammonia should be calculated at 298 K temperature.

  ${\text{NH}}_{\text{3}}{\text{(g)+2CH}}_{\text{4}}\text{(g)+}\frac{\text{5}}{\text{2}}{\text{O}}_{\text{2}}\text{(g)}\to {\text{NH}}_{\text{2}}{\text{CH}}_{\text{2}}{\text{COOH(s)+H}}_{\text{2}}\text{O(l)}$

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.

(c)

Interpretation Introduction

Interpretation:

The standard enthalpy change should be calculated for the preparation of glycine from nitrogen, oxygen and methane.

Concept Introduction:

The mathematical expression for the standard enthalpy change value at room temperature is:

  $\Delta H{°}_R={\displaystyle \sum \text{n}}\text{H°(products})-{\displaystyle \sum \text{p}}\text{H°(reactants)}$

Where, n and p represents the coefficients of reactants and products in the balanced chemical equation.