The heat of fusion of 36.9 g of an unknown metal that releases 2 .51 kJ of energy in freezing 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 ( J ) . 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 1 g of the substance. It is denoted by the symbol ΔH fus .

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Chapter 15, Problem 71E

Interpretation Introduction

Interpretation:

The heat of fusion of 36.9 g of an unknown metal that releases 2.51 kJ of energy in freezing 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 (J). 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 1 g of the substance. It is denoted by the symbol ΔHfus.

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