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Explain why pure liquids and solids can ...

Explain why pure liquids and solids can ignored while writing the equilibrium constant expression?

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[Pure liquid] or[Pure solid]
`=("No.of moles")/("Volume of L")=("Mass"//"mol.mass")/("Volume")`
`=(Mass)/(Volume)=(1)/(Mol.mass)=(Density)/(Mol.mass)` (Density & Moiecular weight are remain constant).
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