Calculate ΔS° for the following reaction. N₂(g)+ 2 O₂(g)→ 2 NO₂(g)

Question

Quizplus · Accepted Answer

To calculate ΔS°, we need to use the following equation: ΔS° = ΣS°(products) - ΣS°(reactants) Where ΣS° is the standard entropy of formation. Using the table of standard entropy of formation, we have: ΔS° = [2S°(NO₂(g))] - [S°(N₂(g)) + 2S°(O₂(g))] = [2(240.1 J/K)] - [(219.1 J/K) + 2(205.0 J/K)] = -121.5 J/K Therefore, the best choice is B, with an explanation that we calculated ΔS° using the equation ΔS° = ΣS°(products) - ΣS°(reactants) and the table of standard entropy of formation.

Calculate ΔS° for the Following Reaction