K Is Dimensionless
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State
An equilibrium constant is treated as dimensionless, since each concentration or pressure term is really a ratio to a reference standard state that cancels its units.
Show
Chemists report K = 4.2, not K = 4.2 mol²/L², even though concentrations carried units when substituted.
Watch for
Attaching units to a reported K value misrepresents the activity-based convention behind the expression.
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