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a level chemistry equilibrium

i was given this question and i'm a bit confused, why is the answer mol^4dm^-12?

Hydrogen gas can be made by reacting ethanol with steam in the presence of a catalyst.
C2H5OH(g) + H2O(g) 2CO(g) + 4H2(g)
State its units of Kc
What are your thoughts so far?

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