   # Chemical Reactions and Energy Calculate the amount of energy in kilojoules produced by the combustion of each of the following: 50 kg of pine wood 2.0 × 10 3 kg of coal a tankful of gasoline (assume the tank holds 60 L of octane with a density of 0.7028 g/mL) ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692

#### Solutions

Chapter
Section ### Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 9, Problem 41E
Textbook Problem
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## Chemical Reactions and EnergyCalculate the amount of energy in kilojoules produced by the combustion of each of the following:50 kg of pine wood 2.0 × 10 3 kg of coala tankful of gasoline (assume the tank holds 60 L of octane with a density of 0.7028 g/mL)

Interpretation Introduction

Interpretation:

The amount of energy in kilojoules produced from combustion of each substance given is to be calculated.

Concept introduction:

Combustion is a process of burning and is a high-temperature exothermic redox chemical reaction that occurs between a fuel and an oxidant, usually in presence of atmospheric oxygen.

The power generated by utilizing chemical or physical resources for providing heat and light or for carrying out various processes, is known as energy. The SI unit of energy is joule.

Unit conversion is defined as the process in which multiple steps are used to convert the unit of measurement for the same given quantity. It is determined by multiplication with a conversion factor.

The fraction in which numerator and denominator are the same quantities but are determined in different units, is known as a conversion factor.

Conversion factor for gram to kilogram is 1 kg1000 g.

Conversion factor for liter to milliliter is 1000 mL1 L.

### Explanation of Solution

a) 50 kg of pine wood

The combustion of pinewood produces heat energy.

The heat of combustion for pinewood is 21 kJ(From table 9.6 ).

First, convert kilograms into grams and then multiply it with the heat of combustion in order to calculate the energy released.

The energy produced in combustion is calculated as follows:

E=(50 kg×1000 g1 kg×21 kJ1 g)=1.1×106 kJ

The negative sign represents that the energy is released.

Therefore, the energy produced in combustion of 50kg of pine wood is 1.1×106 kJ.

b) 2.0×103kg of coal

The combustion of coal produces heat energy.

The heat of combustion for coal is 28 kJ(From table 9.6 ).

Initially, convert kilograms into grams and then multiply it with the heat of combustion in order to calculate the energy released.

The energy produced in combustion is calculated as follows:

E=(2000 kg×1000 g1 kg×28 kJ1 g)=5

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