One mole of SO3 when placed in 2litre vessle at given temperature following equillibrium is established

One mole of SO3 when placed in 2litre vessle at given temperature following equillibrium is established
2SO3=2SO2+O2
Equillibrium mixture contains 2 moles of KMnO4 in acidic medium.what is the equillibrium constant?

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