Chapter U5.103, Problem 2E

Interpretation Introduction

Interpretation: The heat of combustion needs to be described.

Concept introduction: Combustion reactions are used to power vehicles, heat water and homes, and create electricity. But not all combustion reactions provide the same amount of energy.

Answer to Problem 2E

Heat if reaction is the amount of energy that transferred during a chemical reaction. Heat of reaction for a combustion reaction is usually referred to as the heat of combustion.

Explanation of Solution

Heat if reaction is the amount of energy that transferred during a chemical reaction. The symbol for heat of reaction is $\Delta \text{H}$ . Heat of reaction for a combustion reaction is usually referred to as the heat of combustion. When the reaction is exothermic heat of reaction is expressed as negative and if the reaction is endothermic heat of reaction is expressed as positive.

Conclusion

Heat of reaction cab indicated in kilocalories per mole, kilocalories per gram, kilojoules per mole and kilojoules per gram.