Chapter 20, Problem 21PS

Interpretation Introduction

Interpretation:

The energy transferred as heat in kilojoules when $\text{70}\text{lb}$ of coal is burned should be calculated.

Concept introduction:

• Enthalpy of combustion is the energy released by a combustion reaction between hydrocarbons, oxygen and heat source.
• Enthalpy of formation is the heat released or absorbed in a chemical reaction at constant temperature when simple substances combine into a more complex substance.
• $\text{1}\text{lb}\text{=}\text{453}\text{.6}\text{g}$