Question

a. For which reaction in each set will ∆S° be more significant?

b. For which reaction will ∆S° be positive?

Short answer

1. 
2. Noun

Step-by-step solution

 Definition of ∆S°-

Entropy is a measure of a system's freedom of motion.

∆S° = products' freedom of motion minus reactants' freedom of motion

 ∆S° value will be more significant if the number of molecules of reactant differs from the number of molecules in the product.

Also, we will see at which reaction ∆S° is positive.

Therefore, ∆S° will be more significant for the above reactions.

None of the four reactions have a ∆S°.

The product must have more freedom of motion than the reactant in order to have a positive S°. In other words, there should be more product molecules than reactant molecules.