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What do we mean by percentage concentration? - Socratic In general, when we talk of solution concentration in percentages, we mean a percentage by mass, i e mass of solute mass of solution × 100% = ?? % Thus 20⋅ g of solute in 80 ⋅ g of solvent (which is typically water) has a concentration of 20%(m m) These can be converted to concentrations with units of mol ⋅ L−1 PROVIDED we have the density of the solution Anyway, you will have to