BuyFindarrow_forward

Chemistry In Focus

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

Solutions

Chapter
Section
BuyFindarrow_forward

Chemistry In Focus

7th Edition
Tro + 1 other
Publisher: Cengage Learning,
ISBN: 9781337399692
Chapter 9, Problem 41E
Textbook Problem
19 views

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)

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

Still sussing out bartleby?

Check out a sample textbook solution.

See a sample solution

The Solution to Your Study Problems

Bartleby provides explanations to thousands of textbook problems written by our experts, many with advanced degrees!

Get Started

Chapter 9 Solutions

Chemistry In Focus
Show all chapter solutions
add
Ch. 9 - What is the difference between a hot object and a...Ch. 9 - From a molecular standpoint, explain how thermal...Ch. 9 - From a molecular standpoint, explain what heat and...Ch. 9 - List the four sectors of U.S. energy consumption...Ch. 9 - How much energy does the United States consume...Ch. 9 - Explain the first law of thermodynamics and its...Ch. 9 - What is entropy? Why is entropy important?Ch. 9 - Explain the second law of thermodynamics and its...Ch. 9 - What is a perpetual motion machine? Why can such a...Ch. 9 - Approximately how efficient are each of the...Ch. 9 - Define each of the following terms: a. heat b....Ch. 9 - Explain the difference between energy and power.Ch. 9 - What happens to the temperature of the...Ch. 9 - Which temperature scale(s) does not contain...Ch. 9 - What is heat capacity? How is it related to...Ch. 9 - What are our current energy sources and their...Ch. 9 - How long will each of the energy sources in the...Ch. 9 - Why are fossil fuels so named? Where do they come...Ch. 9 - Explain how a fossil-fuel-burning power plant...Ch. 9 - What are the environmental problems associated...Ch. 9 - List the four major components of smog and the...Ch. 9 - What does a catalytic converter do?Ch. 9 - What is the major cause of acid rain?Ch. 9 - Explain how acid rain is formed and its effects on...Ch. 9 - Explain the natural greenhouse effect.Ch. 9 - What would happen to Earths temperature if there...Ch. 9 - What is global warming? Is it occurring? What is...Ch. 9 - What do computer-based climate models predict will...Ch. 9 - How much have CO2 levels increased in the last...Ch. 9 - Which fossil fuel is the worst offender when it...Ch. 9 - Energy Units Perform each of the following...Ch. 9 - A person obtains approximately 2.5103 Calories a...Ch. 9 - A chocolate chip cookie contains about 200 kcal....Ch. 9 - An average person consumes about 2.0103 kcal of...Ch. 9 - Assume that electricity costs 15 cents per...Ch. 9 - Assume that electricity costs 15 cents per...Ch. 9 - Temperature Units Perform each of the following...Ch. 9 - Perform each of the following conversions: a....Ch. 9 - The coldest temperature ever measured in the...Ch. 9 - The warmest temperature ever measured in the...Ch. 9 - Chemical Reactions and Energy Calculate the amount...Ch. 9 - Calculate how many grams of each of the following...Ch. 9 - The useful energy that comes out of an energy...Ch. 9 - A typical 1000-MW electrical generating power...Ch. 9 - Heating the air in a particular house by 10C...Ch. 9 - Heating the water in a 55-gallon water heater...Ch. 9 - Greenhouse Gas Emissions For problem 45, calculate...Ch. 9 - For problem 46, calculate how much CO2 in grams is...Ch. 9 - Calculate the amount of carbon dioxide (in kg)...Ch. 9 - The amount of CO2 in the atmosphere is...Ch. 9 - The second law of thermodynamics has been called...Ch. 9 - You are camping and contemplating placing some hot...Ch. 9 - Some people have criticized the idea that...Ch. 9 - In the 1950s, the United States produced about the...Ch. 9 - The following graph shows U.S. carbon dioxide...

Additional Science Textbook Solutions

Find more solutions based on key concepts
Show solutions add
This controversy addresses accusations launched against sugars in foods and beverages as causes of health probl...

Nutrition: Concepts and Controversies - Standalone book (MindTap Course List)

How might nutritional genomics influence health care in the future?

Understanding Nutrition (MindTap Course List)

Velocity is a(n) ___ quantity. (2.2)

An Introduction to Physical Science

What limits the amplitude of motion of a real vibrating system that is driven at one of its resonant frequencie...

Physics for Scientists and Engineers, Technology Update (No access codes included)

What are the most powerful sources of anthropogenic sound in the ocean?

Oceanography: An Invitation To Marine Science, Loose-leaf Versin