Chapter 20, Problem 20PS

Interpretation Introduction

Interpretation:

It should be determined that the energy in kilo joules used to power a $100watt$ light bulb continuously over an $24$ hour period and the quantity of coal would have to be burned to provide this quantity of energy.

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.
• $\begin{array}{l}\text{1}\text{watt}\text{=}\text{1}\text{J/s}\\ \\ \text{1}\text{kwh}\text{=}\text{3600}\text{kJ}\end{array}$
• $1kWh$ is the quantity of energy transferred when $1000watt$ is dispensed over a $1.0hourperiod$