Problem- At equilibrium at 250C, the following concentration were found for the decomposition reaction: PCl5(g) <=> PCl3(g) + Cl2(g): [PCl5]= 4.2x10^-5 M, [PCl3] = 1.3x10^-2 M, and [Cl2] = 3.9x10^-3 M. What is the value of the equilibrium constant, Kc, for this reaction?
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