Chapter 15, Problem 72E

Interpretation Introduction

Interpretation:

The heat of fusion of $46.9\text{g}$ of naphthalene with an energy input of $7.08\text{kJ}$ is to be calculated.

Concept introduction:

Heat energy is transferred to or from one substance during the change in state. Energy is required to melt a solid. Melting of a solid is an example of an exothermic change. The SI unit of energy is joule $\left(\text{J}\right)$. Fusion is the change of solid to liquid by addition of heat. The heat of fusion of a substance is the energy required to melt $\text{1}\text{g}$ of the substance. It is denoted by the symbol ${\text{ΔH}}_{\text{fus}}$.