A proposed mechanism for a reaction is:

(i) A + B2 = AB2 Ea1 = 12 kJ/mol ƒ´H1 = 3 kJ/mol
(ii) AB2 + C2 = ABC + BC Ea2 = 30 kJ/mol ƒ´H2 = 5.2 kJ/mol
(iii) ABC + B2 = AB2 + BC Ea3 = 10 kJ/mol ƒ´H3 = -7.8
kJ/mol

a) Which is the rate determining step? Explain why.

(ii) It requires the greatest increase in energy, and thus, is the slowest.

b) What is the overall equation for this reaction?

A + 2B2 + C2 = AB2 +2BC deltaH= 0.4 kj/mol

c) Name a reaction intermediate.

ABC

d) Draw a completely labeled energy diagram to scale for the overall reaction. Clearly show deltaHr
and Ea.

?????

Please help!! Please check my work and help with d)

To answer part d) and draw a completely labeled energy diagram for the overall reaction, you need to understand the concept of energy and how it changes during a reaction.

Energy diagrams, also known as reaction coordinate diagrams or potential energy diagrams, are graphical representations that illustrate the energy changes that occur during a chemical reaction. In these diagrams, the y-axis represents energy, and the x-axis represents the progress of the reaction.

Here are the steps to draw a completely labeled energy diagram:

1. Start by drawing the x-axis labeled with the progress of the reaction. You can use the reactant on the left and the product on the right as your endpoints.

2. Label the y-axis as energy.

3. Determine the energy of the reactants and products. Use the given enthalpy change (∆H) values to assign energy values to the reactants and products. In this case, the enthalpy change for the overall reaction is given as ∆H = 0.4 kJ/mol. Based on this information, place the energy level of the reactants and products on the diagram.

4. Identify the transition states or activated complexes. These are the high-energy intermediates that occur during the reaction.

- In this proposed mechanism, the intermediate ABC is formed in step (ii) and used up in step (iii). It is, therefore, a transition state in the overall reaction. Locate the energy level of the ABC intermediate on the energy diagram.
- Additionally, step (ii) has the highest activation energy (Ea2 = 30 kJ/mol). Locate the energy level of this transition state as well.

5. Connect the energy levels of the reactants, products, and transition states with curves or lines. The reactants should be at a higher energy level than the products, and the transition states should be at higher energy levels than both.

6. Label the activation energies (Ea) and the enthalpy changes (∆H) associated with each step on the energy diagram. Use the given values for Ea and ∆H to place the appropriate labels near the corresponding energy levels.

7. Finally, label ∆Hr (the enthalpy change of the reaction) on the energy diagram. This represents the difference in energy between the reactants and the products.

It is important to note that without precise numbers for the energy levels and activation energies, it's challenging to draw an accurate energy diagram to scale. However, you can still create a general diagram that adequately illustrates the concept.

If you have specific numbers for the energy levels and activation energies, I can assist you more accurately in drawing the energy diagram.