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Dinitrogen tetroxide partially decomposes according to the following equilibrium: N2O4(g) → 2NO2(g) A 1.000-L flask is charged with 3.00x0^-2 mol of N2O4. At equilibrium, 2.36x10^-2 mol of N2O4 remains. Keq for this reaction is ____. a) 6.94x10^-3 b) 0.212 c) 0.723 d) 1.92x10^-4 e) 0.391