   # Calculate how many grams of each of the following would be required to produce 7.8 × 10 3 kJ of energy: a. pine wood b. octane c. ethanol d. coal e. natural gas ### 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 42E
Textbook Problem
1 views

## Calculate how many grams of each of the following would be required to produce 7.8 × 10 3 kJ of energy:a. pine woodb. octanec. ethanold. coale. natural gas

Interpretation Introduction

Interpretation:

The amount required (in grams) of each of given items to produce 7.8×103 kJ of energy is to be calculated.

Concept introduction:

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.

### Explanation of Solution

a) Pine wood

The combustion of pinewood produces heat energy. The energy produced during combustion is 7.8×103 kJ.

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

The amount used to produce 7.8×103 kJ energy is calculated as follows:

m=(7.8×103 kJ×1 g21 kJ)=3.7×102 g

Therefore, the quantity of pinewood used to produce 7.8×103 kJ energy is 3.7×102 g.

b) Octane

The combustion of octane produces heat energy. The energy produced during combustion is 7.8×103 kJ.

The heat of combustion for octane is 44.5 kJ(From table 9.6 ).

The amount used to produce 7.8×103 kJ energy is calculated as follows:

m=(7.8×103 kJ×1 g44.5 kJ)=1.8×102 g

Therefore, the quantity of octane used to produce 7.8×103 kJ energy is 1.8×102 g.

c) Ethanol

The combustion of ethanol produces energy. The energy produced during combustion is 7.8×103 kJ.

The heat of combustion for ethanol is 30 kJ(From table 9.6 ).

The amount used to produce 7.8×103 kJ energy is calculated as follows:

m=(7.8×103 kJ×1 g30 kJ)=2

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