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Multiplies molar concentration by the number of particles released on dissolution and by the osmotic coefficient that accounts for non-ideal behaviour.
Osmolarity
Osmolarity = molarity x particles per molecule x osmotic coefficient; plasma is about 290 mOsm/L
Ion pairing means dissolved salts behave as slightly fewer independent particles than full dissociation implies.
Osmolarity is per litre of solution; osmolality is per kilogram of solvent and is what osmometers measure.