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Dinitrogentetraoxide partially decomposes according to the following equilibrium: N2O4 (g) ⇌ 2NO2 (g) A 1.00-L flask is charged with 0.0400 mol of N2O4. At equilibrium at 373 K, 0.0055 mol of N2O4 remains. Keq for this reaction is __________. A) 2.2 × 10^-4 B) 0.87 C) 0.022 D) 0.22 E) 13