What is the equilibrium constant expression for the reaction: 2NO2 (g) ⇌ N2O4 (g)?
Correct: B
The equilibrium constant expression for the reaction 2NO2 (g) ⇌ N2O4 (g) can be written as K = [N2O4] / [NO2]^2. This is because the reaction has two molecules of NO2 on the reactant side and one molecule of N2O4 on the product side.