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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 373 K. An equilibrium is established after some time and only 0.0055 mol of N2O4 remains. What is KC for this reaction?