A student ran the following reaction in the laboratory at 447 K: PCl5(g) ---->PCl3(g) + Cl2(g) When she introduced 1

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A student ran the following reaction in the laboratory
at 447 K:

PCl5(g)
---->PCl3(g)
+ Cl2(g)

When she introduced 1.25 moles
of PCl5(g) into a 1.00 liter
container, she found the equilibrium concentration
of PCl5(g) to
be 1.21 M.

Calculate the equilibrium constant, Kc, she obtained for
this reaction.

Kc =