When calculating the equilibrium constant, aqueous solutes must be expressed in moles per liter (m), and gases must be expressed in pressure as bars. This is because.

Answer by Guest

They are dimensionless ratios of actual concentration or pressure divided by standard state concentration, which is one millimeter for solutions and one bar for gases.

The ratio of an effective concentration or an effective pressure to a standard state pressure or a standard state pressure is defined as a substance's activity. It is usually a one-to-one ratio.Equilibrium constant concentrations are actually dimensionless ratios of actual concentrations divided by standard state concentrations. These are the units to be used because standard states are 1 M for solutes, 1 bar for gases, and pure substances for solids and liquids.As a result, activity acts as a fudge factor in ideal solutions, correcting the true concentration.

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