At 298 K the equilibrium (g) ⇌ 2 (g) exists in a closed container
CHEMISTRY · Single correct · 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
N2O4(g) ⇌ 2 NO2(g)
exists in a closed container. A sudden injection of NO2 gas instantly doubles its concentration, leaving temperature unchanged. Which statement best predicts the system’s response as it re-establishes equilibrium?
(a) [N2O4] will increase and the final K value will be larger.
(b) [N2O4] will decrease and K remains unchanged.
(c) [N2O4] will increase while K remains unchanged.
(d) [N2O4] will remain constant because only NO2 was added.