50.0 g of N2O4 is introduced into anevacuated 2.00 L vessel and allowed to come to equilibrium        with its decomposition product, N2O4(g) 2NO2(g). For this reaction Kc= 0.133. Once the        system has reached equilibrium, 5.00 g of NO2 isinjected into the vessel, and the system is         allowed to equilibrate once again. Calculate the mass ofNO2 in the final equilibrium mixture.

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