Without doing any calculations,determine whether the standard entropy change,ΔS° is positive or negative for each of the following reactions. reaction 1: S(s,rhombic) + O₂(g) → SO₂(g)
Reaction 2: 2 SO₂(g) + O₂(g) → 2 SO₃(g)

Question

Quizplus · Accepted Answer

For reaction 1, the change is going from a solid to a gas, which typically results in a positive ΔS°. 
For reaction 2, there are three gases on the product side and one on the reactant side, indicating an increase in gas molecules and therefore an increase in entropy. Thus, the answer is positive for reaction 2.

Without Doing Any Calculations,determine Whether the Standard Entropy Change,ΔS° Is