What is the value for the equilibrium constant kc

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Problem- A 3.0 liter flask was filled with 12.00 moles of SO3 (g) and heated. After equilibrium was reached it was found that 3.00 moles of gaseous SO2 was present. Assume Reaction 2So3----> 2SO2 + 02. What are the equilibrium concentrations of each of the gases? What is the value for the equilibrium constant Kc?

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