500 G of N₂O₄ Is Introduced into an Evacuated 2

question 88

Multiple Choice

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 K_c = 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. Calculate 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