Extent of Reaction at Equilibrium

Question

For the reaction $$\mathrm{PCl}_5(g) \rightleftharpoons \mathrm{PCl}_3(g) + \mathrm{Cl}_2(g)$$, the equilibrium constant is $$K = 0.0211$$ at 500 K. If an initial 0.100 mol of $$\mathrm{PCl}_5(g)$$ is placed in a 2.00 L container and allowed to reach equilibrium, which statement is most accurate?

Accepted Answer

Approximately half of the PCl5 decomposes

Answer

More than 90% of the original PCl5 remains unreacted

Answer

PCl5 completely decomposes to PCl3 and Cl2

Answer

Equal amounts of PCl5, PCl3, and Cl2 are present

Extent of Reaction at Equilibrium

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