Chapter 14, Problem 14.31QP

(a)

Interpretation Introduction

Interpretation:

A plot of potential-energy-versus-reaction-progress for the given reaction has to be sketched.

Concept introduction:

The plot of potential-energy-versus-reaction-progress enables the study of endothermic, exothermic reactions.

The co-ordinates in the plot of potential-energy-versus-reaction-progress should be plotted as follows.

• The progress of reaction in time has to be plotted in X-axis of the plot.
• The potential energy of the reaction has to be plotted in Y-axis of the plot.

$\text{ΔH}\text{is enthanpy change}\text{.}$

It refers to the amount of heat absorbed or released in a reaction.

The signs of $\Delta H$:

If the value of $\Delta H$ is less than zero, then the $-ve$ sign of the value represents that the heat is released out by the system and it is known as $Exothermicprocess\left(Exo=out;thermic=heat\right)$.

If the value of $\Delta H$ is more than zero, then the $+ve$ sign of the value represents that the heat is absorbed in by the system and it is known as $Endothermicprocess\left(Endo=in;thermic=heat\right)$.

(b)

Interpretation Introduction

Interpretation:

A plot of potential-energy-versus-reaction-progress for the given reaction has to be sketched.

Concept introduction:

The plot of potential-energy-versus-reaction-progress enables the study of endothermic, exothermic reactions.

The co-ordinates in the plot of potential-energy-versus-reaction-progress should be plotted as follows.

• The progress of reaction in time has to be plotted in X-axis of the plot.
• The potential energy of the reaction has to be plotted in Y-axis of the plot.

$\text{ΔH}\text{is enthanpy change}\text{.}$

It refers to the amount of heat absorbed or released in a reaction.

The signs of $\Delta H$:

If the value of $\Delta H$ is less than zero, then the $-ve$ sign of the value represents that the heat is released out by the system and it is known as $Exothermicprocess\left(Exo=out;thermic=heat\right)$.

If the value of $\Delta H$ is more than zero, then the $+ve$ sign of the value represents that the heat is absorbed in by the system and it is known as $Endothermicprocess\left(Endo=in;thermic=heat\right)$.