a. Which of the reactions in Figure 5.3 has a product that

Solution:

Here we asked to write the product or reactant which is thermodynamically stable or kinetically stable, from the given graph.

Gibbs free energy: -Gibbs free energy is denoted as ΔG, is equal to the sum of the enthalpy plus the product of the temperature and entropy of the system.

 ΔG =  ΔH - TΔS

Kinetically stable product: - Product that has a small rate constant (large ΔGo) for the reverse reaction.

Thermodynamically unstable product: - A product is said to be thermodynamically unstable when it is less stable than the reactant.

Kinetically Unstable product: - A product is said to be kinetically unstable if, the product has larger rate constant (small ΔGovalue) for the reverse reaction.

Step 1

1. In the figure a and figure b, it has been seen that the product is more stable than the reactant.

Thus in those two figures (a and b) product is thermodynamically stable compared with the reactant.

Thus the figure a and figure b are thermodynamically stable compared with the reactant.