Concept explainers
(a) (i)
Interpretation: The change in energy for the given
Concept introduction: In a chemical reaction, energy is either gained, endothermic reactions, or released, exothermic reactions. The change in energy can be stated as the difference between the energy required to break the bonds in case of reactants and the energy released on the formation of the products.
To determine: The change in energy for the stated reactions.
(a) (i)

Answer to Problem 153CP
The change in energy
Explanation of Solution
Given
The chemical reaction involved is,
Formula
Energy for reactants,
The total energy
For products,
The total energy
The change in energy
(ii)
Interpretation: The change in energy for the given chemical reactions has to be calculated.
Concept introduction: In a chemical reaction, energy is either gained, endothermic reactions, or released, exothermic reactions. The change in energy can be stated as the difference between the energy required to break the bonds in case of reactants and the energy released on the formation of the products.
To determine: The change in energy for the stated reactions.
(ii)

Answer to Problem 153CP
The change in energy
Explanation of Solution
Given
The chemical reaction involved is,
Formula
Energy for reactants,
The total energy
For products,
The total energy
The change in energy
(iii)
Interpretation: The change in energy for the given chemical reactions has to be calculated.
Concept introduction: In a chemical reaction, energy is either gained, endothermic reactions, or released, exothermic reactions. The change in energy can be stated as the difference between the energy required to break the bonds in case of reactants and the energy released on the formation of the products.
To determine: The change in energy for the stated reactions.
(iii)

Answer to Problem 153CP
The change in energy
Explanation of Solution
Given
The chemical reaction involved is,
Formula
Energy for reactants,
The total energy
For products,
The total energy
The change in energy
The change in energy can be stated as the difference between the energy required to break the bonds in case of reactants and the energy released on the formation of the products.
(b)
Interpretation: The change in energy for the given chemical reactions has to be calculated.
Concept introduction: In a chemical reaction, energy is either gained, endothermic reactions, or released, exothermic reactions. The change in energy can be stated as the difference between the energy required to break the bonds in case of reactants and the energy released on the formation of the products.
To determine: The reaction that releases the larger amount of energy per kilogram of
(b)

Answer to Problem 153CP
The reaction (iii) releases the largest amount of energy per kilogram of
Explanation of Solution
One mole of
In case of the (i) reaction,
Hence,
In case of the (ii) reaction,
Hence,
In case of the (iii) reaction,
Hence,
The reaction (iii) releases the largest amount of energy per kilogram of
The third stated reaction releases the largest amount of energy per kilogram of
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Chapter 3 Solutions
EBK CHEMISTRY: AN ATOMS FIRST APPROACH
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