Consider the following reaction carried out in a sealed container: 2SO₃(g)⇌ 2SO₂(g)+ O₂(g)A state of equilibrium cannot be reached if the container initially contains

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For a reaction to reach equilibrium, there must be a possibility for both the forward and reverse reactions to occur. If the container only contains $O_2$, the reverse reaction cannot proceed because there are no products ($SO_3$ or $SO_2$) to convert back into reactants.

Consider the Following Reaction Carried Out in a Sealed Container