Consider the reaction 2 NO₂(g) ⇌ 2 NO(g) + O₂(g). If the initial molar concentration of NO₂(g) is 0.030 mol · L^–1, and c is the equilibrium molar concentration of O₂(g) in moles per liter, which of the following expressions is the correct equilibrium relation?

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(a) K c³; (b) Kc 2c²/(0.030 2c)²;