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Dinitrogen tetraoxide is a colorless gas that dissociates into a nitrogen dioxide, a reddish brown gas. N2O4 (g) ⇌ 2 NO2 (g) An experiment was run to demonstrate that this is a dynamic equilibrium. Starting with a special form of N2O4 where one of the oxygens was isotopically labeled (18-O instead of 16-O), the system was then allowed to reach equilibrium. Indicate with Y (yes) or N (no) which of the substances below show that the forward or reverse reactions occur for this chemical system.