Initially colorless N₂O₄(g) is placed in a sealed

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

Problem

Initially colorless N₂O₄(g) is placed in a sealed, isothermal 1.0 L flask at 298 K. Over time the gas mixture becomes light brown and the color intensity stops changing. Explain what this observation reveals about the reversibility of the dimerization reaction N₂O₄(g) ⇌ 2 NO₂(g).

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