The concentration of a pure condensed (solid or liquid) phase is not included in the expression of the equilibrium constant because

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solid and liquid concentrations are independent of their quantities

solids and liquids react slowly

solids and liquids at equilibrium have no interactions with the gaseous phase

the molecules in solids and liquids cannot migrate to the gaseous phase

answer is A.

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Detailed Solution

The concentration of a pure condensed (solid or liquid) phase is not included in the expression of the equilibrium constant because solid and liquid concentrations are independent of their quantities.

Solids and pure liquids have concentrations that are independent of their quantities. The equation for the equilibrium constant does not include them

Hence option A is correct.

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