Calculate the mass of NO2 in the final equilibrium equation when 50.0g of N2O4 is added to an evacuated 2.00L 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, 5.00g of NO2 is injected into the vessel, and the system is allowed to equilibrate once again.