At 25°C, a mixture of NO2 and N2O4 gases are in equilibrium in a cylinder fitted with a movable piston. The concentrations are [NO2] = 0.0475 M and [N2O4] = 0.487 M. The volume of the gas mixture is halved by pushing down on the piston at constant temperature. Calculate the concentrations of the gases when equilibrium is reestablished. Will the color become darker or lighter after the change? [Hint: Kcfor the dissociation of N2O4 is 4.63 × 10−3. N2O4(g) is colorless, and NO2(g) has a brown color.]
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