At a certain temperature K for the reaction 2NO2 N2O4 is 7.5 liters/mole. If 2.0 moles of NO2 are placed in a 2.0-liter container and permitted to react at this temperature, calculate the concentration of N2O4 at equilibrium.  a 0.39 moles/liter  b 0.65 moles/liter  c 0.82 moles/liter  d 7.5 moles/liter  e none of these

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