11. Draw a potential energy diagram for a two-step reaction in which the activation energies are 10 kcal/mol (first step) and 3 kcal/mole (second step), the intermediate is 5 kcal/mol higher in energy than the reactants, and the products are 1 kcal/mol lower in energy than the reactants. Label both axes and positions on the curve that correspond to reactants (R), the intermediate (I), transition states (TS₁, TS2), and products (P). Indicate the activation barriers with vertical lines and the labels Eat and Ea2.

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**Potential Energy Diagram for a Two-Step Reaction**

In this exercise, we will draw a potential energy diagram for a reaction that occurs in two steps. The reaction parameters are given as follows:

- Activation energies: 
  - First step: 10 kcal/mol
  - Second step: 3 kcal/mol
- Intermediate state: 5 kcal/mol higher in energy than the reactants
- Products: 1 kcal/mol lower in energy than the reactants

Additionally, the diagram should be appropriately labeled to indicate the reactants (R), intermediate (I), transition states (TS1, TS2), and products (P). The activation energy barriers should be marked with vertical lines and labeled Ea1 and Ea2.

### Steps to Create the Diagram:

1. **Draw the Axes:**
   - X-axis (Reaction Progress)
   - Y-axis (Potential Energy in kcal/mol)

2. **Plot the Points:**
   - Start with the reactants (R) at an arbitrary energy level, say 0 kcal/mol.
   - From the reactants, draw an energy peak representing the first transition state (TS1) with an energy level of 10 kcal/mol above the reactants.
   - Below TS1, plot the intermediate (I) at an energy level 5 kcal/mol higher than the reactants (5 kcal/mol above 0).
   - From the intermediate, draw another smaller peak for the second transition state (TS2) at 3 kcal/mol above the intermediate (therefore, 8 kcal/mol above the initial reactants).
   - Finally, plot the products (P) at an energy level 1 kcal/mol lower than the reactants (-1 kcal/mol).

3. **Indicate Activation Barriers:**
   - Draw vertical lines from the peaks (transition states) down to the respective reactants and intermediate points.
   - Label the lines as Ea1 (10 kcal/mol) and Ea2 (3 kcal/mol).

### Explanation of the Diagram:

- **Axes:** The X-axis denotes the progress of the reaction from reactants to products, while the Y-axis shows the potential energy in kcal/mol.
- **Reactants (R):** Represent the starting materials of the reaction, typically at an energy baseline (0 kcal/mol).
- **Transition State 1 (TS1):** The highest energy peak due to the first activation energy barrier (Ea1) at 10 kcal/mol above the reactants.
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Transcribed Image Text:**Potential Energy Diagram for a Two-Step Reaction** In this exercise, we will draw a potential energy diagram for a reaction that occurs in two steps. The reaction parameters are given as follows: - Activation energies: - First step: 10 kcal/mol - Second step: 3 kcal/mol - Intermediate state: 5 kcal/mol higher in energy than the reactants - Products: 1 kcal/mol lower in energy than the reactants Additionally, the diagram should be appropriately labeled to indicate the reactants (R), intermediate (I), transition states (TS1, TS2), and products (P). The activation energy barriers should be marked with vertical lines and labeled Ea1 and Ea2. ### Steps to Create the Diagram: 1. **Draw the Axes:** - X-axis (Reaction Progress) - Y-axis (Potential Energy in kcal/mol) 2. **Plot the Points:** - Start with the reactants (R) at an arbitrary energy level, say 0 kcal/mol. - From the reactants, draw an energy peak representing the first transition state (TS1) with an energy level of 10 kcal/mol above the reactants. - Below TS1, plot the intermediate (I) at an energy level 5 kcal/mol higher than the reactants (5 kcal/mol above 0). - From the intermediate, draw another smaller peak for the second transition state (TS2) at 3 kcal/mol above the intermediate (therefore, 8 kcal/mol above the initial reactants). - Finally, plot the products (P) at an energy level 1 kcal/mol lower than the reactants (-1 kcal/mol). 3. **Indicate Activation Barriers:** - Draw vertical lines from the peaks (transition states) down to the respective reactants and intermediate points. - Label the lines as Ea1 (10 kcal/mol) and Ea2 (3 kcal/mol). ### Explanation of the Diagram: - **Axes:** The X-axis denotes the progress of the reaction from reactants to products, while the Y-axis shows the potential energy in kcal/mol. - **Reactants (R):** Represent the starting materials of the reaction, typically at an energy baseline (0 kcal/mol). - **Transition State 1 (TS1):** The highest energy peak due to the first activation energy barrier (Ea1) at 10 kcal/mol above the reactants. -
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