Chapter 6, Problem 6.35P

(a)

Interpretation Introduction

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

  $\frac{1}{8}{\text{S}}_{\text{8}}\left(s\right)+{\text{H}}_{\text{2}}\left(g\right)\to {\text{H}}_{\text{2}}\text{S}\left(g\right)\text{ΔH}=-20.2\text{kJ}$

Concept Introduction: In exothermic process heat is given out along with the product. A reaction that absorbs heat is endothermic reaction.

(b)

Interpretation Introduction

Interpretation: $\Delta \text{H}$ for the reverse reaction is to be determined.

Concept Introduction: Enthalpy is the total kinetic and potential energy of a system at a constant pressure.

(c)

Interpretation Introduction

Interpretation: $\Delta \text{H}$ is to be calculated when 2.6 mole of ${\text{S}}_{\text{8}}$ reacts.

Concept Introduction: Enthalpy is the total kinetic and potential energy of a system at a constant pressure.

(d)

Interpretation Introduction

Interpretation: $\Delta \text{H}$ when 25.0 g of ${\text{S}}_{\text{8}}$ reacts is to be determined.

Concept Introduction: Enthalpy is the total kinetic and potential energy of a system at a constant pressure.