Organic Chemistry
Organic Chemistry
5th Edition
ISBN: 9780078021558
Author: Janice Gorzynski Smith Dr.
Publisher: McGraw-Hill Education
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Chapter 6, Problem 6.22P
Interpretation Introduction

(a)

Interpretation: Whether the given statement is true for a reaction with Keq=0.8 and Ea=80kJ/mol is to be stated. The false statement is to be corrected.

Concept introduction: The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It results in the increases of a rate of reaction.

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. They are state functions. The relation ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Expert Solution
Check Mark

Answer to Problem 6.22P

The given statement is false. The true statement is, the rate of the reaction with Keq=0.8 and Ea=80kJ/mol is equal to a reaction with Keq=8 and Ea=80kJ/mol.

Explanation of Solution

The given statement is “the reaction is faster than a reaction with Keq=8 and Ea=80kJ/mol”.

The value of Keq does not have any affect on the rate of reaction, due to which the given statement is false.

Therefore, the correct statement is the rate of the given reaction is equal to a reaction with Keq=8 and Ea=80kJ/mol.

Conclusion

The given statement is false. The true statement is, the rate of the reaction with Keq=0.8 and Ea=80kJ/mol is equal to a reaction with Keq=8 and Ea=80kJ/mol.

Interpretation Introduction

(b)

Interpretation: Whether the given statement is true for a reaction with Keq=0.8 and Ea=80kJ/mol is to be stated. The false statement is to be corrected.

Concept introduction: The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It results in the increases of a rate of reaction.

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. They are state functions. The relation ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Expert Solution
Check Mark

Answer to Problem 6.22P

The true statement is, the rate of the reaction with Keq=0.8 and Ea=80kJ/mol is lower than a reaction with Keq=0.8 and Ea=40kJ/mol.

Explanation of Solution

The given statement is “the reaction is faster than a reaction with Keq=0.8 and Ea=40kJ/mol”.

The value of Ea affects the rate of reaction. In the given statement Ea has low value. The low value of Ea increases the reaction rate. Hence, this statement is false.

Therefore, the correct statement is the rate of the given reaction is lower than the reaction with Keq=0.8 and Ea=40kJ/mol.

Conclusion

The given statement is false. The true statement is, the rate of the reaction with Keq=0.8 and Ea=80kJ/mol is lower than a reaction with Keq=0.8 and Ea=40kJ/mol.

Interpretation Introduction

(c)

Interpretation: Whether the given statement is true for a reaction with Keq=0.8 and Ea=80kJ/mol is to be stated. The false statement is to be corrected.

Concept introduction: The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It results in the increases of a rate of reaction.

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. They are state functions. The relation ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Expert Solution
Check Mark

Answer to Problem 6.22P

The given statement, ΔG° for the reaction is a positive value is true.

Explanation of Solution

The given statement is “ΔG° for the reaction is a positive value”.

The value of Keq is 0.8.

The relation of ΔG° with Keq is shown below.

ΔG°=RTlnKeq

Substitute the value of Keq in the above expression.

ΔG°=RTln0.8=RT(0.223)=0.223RT

Therefore, the given statement is true.

Conclusion

The given statement, ΔG° for the reaction is a positive value is true.

Interpretation Introduction

(d)

Interpretation: Whether the given statement is true for a reaction with Keq=0.8 and Ea=80kJ/mol is to be stated. The false statement is to be corrected.

Concept introduction: The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It results in the increases of a rate of reaction.

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. They are state functions. The relation ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Expert Solution
Check Mark

Answer to Problem 6.22P

The given statement, the starting materials are lower in energy than the products of the reaction is true.

Explanation of Solution

The given statement is, “the starting materials are lower in energy than the products of the reaction”.

The given reaction has positive ΔG° value, which implies that the reaction is not feasible and the reactants have lower energy than the products of the reaction.

Therefore, the given statement is true.

Conclusion

The given statement, the starting materials are lower in energy than the products of the reaction is true.

Interpretation Introduction

(e)

Interpretation: Whether the given statement is true for a reaction with Keq=0.8 and Ea=80kJ/mol is to be stated. The false statement is to be corrected.

Concept introduction: The activation energy (Ea) aids in determining the rate of the chemical reactions. The small value of Ea exhibits that less energy is required to convert the reactants into products. It results in the increases of a rate of reaction.

The change in Gibbs free energy, enthalpy and entropy is represented by ΔG°, ΔH° and ΔS° respectively. They are state functions. The relation ΔG° with ΔH° and ΔS° is shown as,

ΔG°=ΔH°TΔS°

The change in Gibbs free energy describes the spontaneity of the reaction. The change in enthalpy describes the relative bond strength in the substance, whereas the change in entropy describes the randomness in the system.

Expert Solution
Check Mark

Answer to Problem 6.22P

The given statement is false. The correct statement is, the reaction is exothermic.

Explanation of Solution

The given statement is, “the reaction is exothermic”.

The statement in part (d) states that the starting materials possess lower energy than the products of the reaction. It indicates that bonds of reactants are stronger due to which they absorb energy. Hence, the given statement is false.

Therefore, the correct statement is, the reaction is exothermic.

Conclusion

The given statement is false. The correct statement is, the reaction is exothermic.

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Chapter 6 Solutions

Organic Chemistry

Ch. 6 - Given each of the following values, is the...Ch. 6 - The equilibrium constant for the conversion of the...Ch. 6 - Prob. 6.13PCh. 6 - For a reaction with H=40kJ/mol, decide which of...Ch. 6 - For a reaction with H=20kJ/mol, decide which of...Ch. 6 - Draw an energy diagram for a reaction in which the...Ch. 6 - Prob. 6.17PCh. 6 - Prob. 6.18PCh. 6 - Problem 6.19 Consider the following energy...Ch. 6 - Draw an energy diagram for a two-step reaction,...Ch. 6 - Which value if any corresponds to a faster...Ch. 6 - Prob. 6.22PCh. 6 - Problem 6.23 For each rate equation, what effect...Ch. 6 - Prob. 6.24PCh. 6 - Identify the catalyst in each equation. a....Ch. 6 - Draw the products of homolysis or heterolysis of...Ch. 6 - Explain why the bond dissociation energy for bond...Ch. 6 - Classify each transformation as substitution,...Ch. 6 - Prob. 6.29PCh. 6 - 6.30 Draw the products of each reaction by...Ch. 6 - 6.31 (a) Add curved arrows for each step to show...Ch. 6 - Prob. 6.32PCh. 6 - Prob. 6.33PCh. 6 - Prob. 6.34PCh. 6 - Calculate H for each reaction. a HO+CH4CH3+H2O b...Ch. 6 - Homolysis of the indicated CH bond in propene...Ch. 6 - Prob. 6.37PCh. 6 - Prob. 6.38PCh. 6 - 6.39. a. Which value corresponds to a negative...Ch. 6 - Prob. 6.40PCh. 6 - For which of the following reaction is S a...Ch. 6 - Prob. 6.42PCh. 6 - Prob. 6.43PCh. 6 - 6.44 Consider the following reaction: . Use curved...Ch. 6 - Prob. 6.45PCh. 6 - Draw an energy diagram for the Bronsted-Lowry...Ch. 6 - Prob. 6.47PCh. 6 - Indicate which factors affect the rate of a...Ch. 6 - Prob. 6.49PCh. 6 - 6.50 The conversion of acetyl chloride to methyl...Ch. 6 - Prob. 6.51PCh. 6 - Prob. 6.52PCh. 6 - The conversion of (CH3)3Cl to (CH3)2C=CH2 can...Ch. 6 - 6.54 Explain why is more acidic than , even...Ch. 6 - Prob. 6.55PCh. 6 - Prob. 6.56PCh. 6 - Prob. 6.57PCh. 6 - Although Keq of equation 1 in problem 6.57 does...Ch. 6 - Prob. 6.59P
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