Calculate the standard entropy change for the following reaction: 2 SO₂(g)+ O₂(g)→ 2 SO₃(g) Given: S°[SO₂(g)] = 248.2 J/K⋅mol,S°[O₂(g)] = 205.1 J/K⋅mol,and S°[SO₃(g)] = 256.8 J/K⋅mol. A) -196.5 J/K·mol-rxn B) -94.0 J/K·mol-rxn C) -187.9 J/K·mol-rxn D) +187.9 J/K·mol-rxn E) +196.5 J/K·mol-rxn

Question

Quizplus · Accepted Answer

ΔS°rxn = ΣS°(products) - ΣS°(reactants) ΔS°rxn = [2 × S°(SO₃(g))] - [2 × S°(SO₂(g))] - [S°(O₂(g))] ΔS°rxn = [2 × 256.8 J/K·mol] - [2 × 248.2 J/K·mol] - [205.1 J/K·mol] ΔS°rxn = -187.9 J/K·mol-rxn Therefore, the correct answer is C, as it matches the calculated value for the standard entropy change of the reaction.

Calculate the Standard Entropy Change for the Following Reaction: 2