Question

a. Which of the following reactions will have the larger ΔS° value?

b. Will the ΔS° value be positive or negative?\

Short answer

a) B will have the largerΔS°value. As in A reactant and product are same but in B these are different.

b) In B Product has greater freedom of motion then it has ΔS° value positive.

Step-by-step solution

What is ΔS° value

S value is always positive. But ΔS° denotes change in entropy. Entropy means the degree of randomness and disorder of the molecules. It can be negative or positive. If the products are less than the reactants then disorder decreases so ΔS° value becomes negative. If the reactant and products are in same number then the ΔS° value becomes zero. If the products are more in number than the reactant then ΔS° value will be positive.

Final answer

a)

A) In this the number of reactants and products are same so It has zero ΔS° value.

B) In this products are more than reactants so that it has larger ΔS° value.

b)

A) In this the number of reactants and products are same so It has zero ΔS° value. So in this ΔS° value is neither positive nor negative.

B) In this products are more than reactants so that it has larger ΔS° value. So in this ΔS° value is positive.