Chapter 15.6, Problem 2Q

(a)

Interpretation Introduction

Interpretation: The given reaction has to be identified for endothermic or exothermic.

Concept Introduction: Enthalpy change for the reaction ${\text{Δ}}_{\text{r}}{\text{H}}^{\text{0}}$=${\text{ΣnΔ}}_{\text{f}}{\text{H}}^{\text{0}}\text{(products)}\text{-}{\text{ΣnΔ}}_{\text{f}}{\text{H}}^{\text{0}}\text{(reactants)}$

Exothermic when $\text{ΔH}$ is negative and endothermic when $\text{ΔH}$ is positive.

(b)

Interpretation Introduction

Interpretation: The mass of $C{O}_2$ that is produced as a by-product has to be identified.

Concept Introduction: Enthalpy change for the reaction ${\text{Δ}}_{\text{r}}{\text{H}}^{\text{0}}$=${\text{ΣnΔ}}_{\text{f}}{\text{H}}^{\text{0}}\text{(products)}\text{-}{\text{ΣnΔ}}_{\text{f}}{\text{H}}^{\text{0}}\text{(reactants)}$

Exothermic when $\text{ΔH}$ is negative and endothermic when $\text{ΔH}$ is positive.