At constant pressure, the reaction
2NO₂(g) → N₂O₄(g)
Is exothermic. The reaction (as written) is

Question

At constant pressure, the reaction 2NO₂(g) → N₂O₄(g) Is exothermic. The reaction (as written) is

Quizplus · Accepted Answer

For an exothermic reaction, the spontaneity at different temperatures can be understood through the Gibbs free energy equation, ΔG = ΔH - TΔS. Since the reaction is exothermic (ΔH < 0), it tends to be spontaneous at low temperatures where the TΔS term is less significant. At high temperatures, the TΔS term becomes more significant and can make ΔG positive, thus making the reaction non-spontaneous.

At Constant Pressure, the Reaction