Density (g/ml or g/cm3) = solution mass (g) ÷ solution volume (ml or cm3)

Mass fraction = 100%× solute mass (g) ÷ solution mass (g)

Quantity concentration of substance (mol/L) = quantity of solute substance (mol) ÷ solution volume (L)

Take 1L solution as an example:

Solute mass (g)= solution volume (L)× substance concentration (mol/L)× molar mass (g/mol)

Or = solution volume (mL)× solution density (g/mL)× mass fraction.