free energy. kJ/mol 5 20 15 10 O 10 kJ/mol O 5 kJ/mol O 15 kJ/mol reaction coordinate O more information required

Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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### Understanding Activation Energy

**Question: What is the activation energy for the following reaction?**

To determine the activation energy of a given reaction, one can use the provided energy diagram. The diagram presents the change in free energy (in kJ/mol) along the reaction coordinate. In the graph, the y-axis represents the free energy (kJ/mol), and the x-axis denotes the reaction coordinate.

#### Graph Description:
- **Free Energy Curve**: The graph showcases a typical free energy profile for a chemical reaction. The curve starts at an initial free energy level of approximately 10 kJ/mol, rises to a peak value near 20 kJ/mol (indicating the activation energy), and then drops down, representing the progression of the reaction.

#### Options for the Activation Energy:
1. **5 kJ/mol**
2. **15 kJ/mol**
3. **More information required**
4. **10 kJ/mol**

To find the activation energy, identify the highest point on the curve (peak) and note the energy difference between this peak and the initial energy level.

In this case:
- **Initial free energy (reactant state)**: ~10 kJ/mol
- **Peak free energy (transition state)**: ~20 kJ/mol

#### Calculation:
- **Activation Energy (Ea)** = Peak energy - Initial energy
- **Ea** = 20 kJ/mol - 10 kJ/mol
- **Ea** = 10 kJ/mol

**Correct Answer: 10 kJ/mol**
Transcribed Image Text:### Understanding Activation Energy **Question: What is the activation energy for the following reaction?** To determine the activation energy of a given reaction, one can use the provided energy diagram. The diagram presents the change in free energy (in kJ/mol) along the reaction coordinate. In the graph, the y-axis represents the free energy (kJ/mol), and the x-axis denotes the reaction coordinate. #### Graph Description: - **Free Energy Curve**: The graph showcases a typical free energy profile for a chemical reaction. The curve starts at an initial free energy level of approximately 10 kJ/mol, rises to a peak value near 20 kJ/mol (indicating the activation energy), and then drops down, representing the progression of the reaction. #### Options for the Activation Energy: 1. **5 kJ/mol** 2. **15 kJ/mol** 3. **More information required** 4. **10 kJ/mol** To find the activation energy, identify the highest point on the curve (peak) and note the energy difference between this peak and the initial energy level. In this case: - **Initial free energy (reactant state)**: ~10 kJ/mol - **Peak free energy (transition state)**: ~20 kJ/mol #### Calculation: - **Activation Energy (Ea)** = Peak energy - Initial energy - **Ea** = 20 kJ/mol - 10 kJ/mol - **Ea** = 10 kJ/mol **Correct Answer: 10 kJ/mol**
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