CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
For the reaction N₂O₄(g) ⇌ 2 NO₂(g) at 298 K, the equilibrium constant is Kc = 0.21. An equilibrium mixture in a 1.00 L container contains [N₂O₄] = 0.40 M and [NO₂] = 0.29 M. A pulse of NO₂ is injected, raising its concentration instantly to 0.39 M. Calculate the reaction quotient Qc immediately after the injection and state whether the forward or reverse reaction will be favored as the system returns to equilibrium.