Chapter 18, Problem 73A

Interpretation Introduction

Interpretation: The explanation for what is meant to say that a process is 50 percent efficient is to be stated.

Concept Introduction: The energy which is available to do work some useful work is termed free energy.

Answer to Problem 73A

If a process is 50 percent efficient that means that only about 50 percent of the free energy is released and is used for the reaction to take place.

Explanation of Solution

For example, the energy which is released in a chemical reaction can be harnessed to do work, such as pushing the pistons in an internal-combustion engine. This type of energy is called free energy. Just because energy is available for the work to be done does not mean it can be used efficiently.

If a process is 50 percent efficient that means that only about 50 percent of the free energy is released and is used for the reaction to take place. The remaining 50 percent of energy is lost as waste heat and friction.