Chapter 17.2, Problem 17LC

Interpretation Introduction

Interpretation: The way enthalpy changes are expressed is to be written.

Concept Introduction : Enthalpy change is the amount of energy released or absorbed in a reaction at constant pressure.

Answer to Problem 17LC

The change in enthalpy is represented by $\Delta \text{H}$ in a chemical equation.

Explanation of Solution

The enthalpy change, $\Delta \text{H}$ for a reaction is expressed after a balanced chemical equation. The positive value of $\Delta \text{H}$ represents an exothermic reaction, which means heat is released during the chemical reaction. A negative value of $\Delta \text{H}$ represents an endothermic reaction, which means heat is absorbed during the chemical reaction.