The gaseous equilibrium CO(g) + Cl₂(g) ⇌ COCl₂(g) is established in a sealed vessel…

CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

The gaseous equilibrium CO(g) + Cl₂(g) ⇌ COCl₂(g) is established in a sealed vessel at 500 K. After equilibrium is reached, a small amount of COCl₂(g) is suddenly injected, instantly increasing its concentration. Predict whether the concentration of Cl₂ will increase, decrease, or remain unchanged as the system attains its new equilibrium, and briefly justify your answer.

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