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H2O is a liquid so it would not be included in calculating the equilibrium constant. This is because solids and liquids do not affect the reactant amount at equilibrium in the reaction, so they are disregarded and kept at 1.
Solids and liquids are not included because any change would not be sufficient to cause a drastic impact in the concentration of reactants. It is like saying you remove .10 cents from your $1000 savings account and thus that amount is not significant.
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