   Chapter 20, Problem 21PS

Chapter
Section
Textbook Problem

Per capita energy consumption in the United States has been equated to the energy obtained by burning 70. lb of coal per day. Use enthalpy of formation data to calculate the energy transferred as heat, in kilojoules, when 70. lb of coal is burned. (Assume the enthalpy of combustion of coal is 33 kJ/g.)

Interpretation Introduction

Interpretation:

The energy transferred as heat in kilojoules when 70lb 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.
• 1lb=453.6g
Explanation

Given,

The enthalpy of combustion of coal is 33KJ/g .

Per capita energy consumption in the United States has been equated to the energy obtained by burning 70lb of coal per day.

The lb unit (pound) can be converted into gram by multiplying the given value with 453.6g/lb.

Then the energy released as heat in kilojoules, when 70lb of coal is burned can be calculated as follows,

70.0lb×(453

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