Suppose 50.0 g of N2O4 is introduced into an evacuated 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 is injected into the vessel, and the system is allowed to equilibrate once again. What is the mass of N2O4 in the final equilibrium mixture?
A) 39.5 g
B) 35.3 g
C) 30.3 g
D) 25.2 g
E) 43.7 g
Correct Answer:
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