At 298 K the equilibrium constant for the reaction N2O4(g) ⇌ 2 NO2(g) is Kc = 0.36
CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)
Problem
At 298 K the equilibrium constant for the reaction
N2O4(g) ⇌ 2 NO2(g)
is Kc = 0.36. Three sealed 1.00 L flasks are prepared as follows:
Flask I: [NO2] = 0.20 M, [N2O4] = 0.50 M
Flask II: [NO2] = 0.40 M, [N2O4] = 0.50 M
Flask III: [NO2] = 0.70 M, [N2O4] = 0.20 M
Rank the flasks from greatest to least in terms of the extent of the shift toward formation of NO2 that will occur as each mixture returns to equilibrium.