Chapter 5, Problem 5.7VP

(a)

Interpretation Introduction

Interpretation: The reason for putting all elements on the same horizontal line and reason for calling ${\text{C}}_2{\text{H}}_2\left(g\right)$ an endothermic compound is to be stated. The heat of the reaction that converts a stoichiometric mixture of ${\text{C}}_2{\text{H}}_2\left(g\right)$ and ${\text{O}}_2\left(g\right)$ to $\text{CO}\left(g\right)$ and ${\text{H}}_2\text{O}\left(g\right)$, is to be calculated.

Concept introduction: The amount of energy released or absorbed during the formation of one mole of product from its pure elements at standard conditions is known as enthalpy of formation.

To determine: The reason for putting all elements on the same horizontal line

(b)

Interpretation Introduction

To determine: The reason for calling ${\text{C}}_2{\text{H}}_2\left(g\right)$ an endothermic compound.

(c)

Interpretation Introduction

To determine: The heat of the reaction that converts a stoichiometric mixture of ${\text{C}}_2{\text{H}}_2\left(g\right)$ and ${\text{O}}_2\left(g\right)$ to $\text{CO}\left(g\right)$ and ${\text{H}}_2\text{O}\left(g\right)$.