For the reaction 2 SO3 (g) ⇌ 2 SO2 (g) + O2 (g), which of the following is the correct equilibrium expression for Kc?
A. Kc = [SO3]2 / [SO2]2 [O2]
B. Kc = [SO2]2 [O2] / [SO3]2
C.Kc = 2 [SO2] [O2] / 2 [SO3]
D. Kc = 2 [SO3] / 2 [SO2] [O2]
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