dimensionless quantity; mass fraction (percentage by weight, wt%) and molefraction (percentage by moles, mol%) are others. Volume percent is the concentration of
for molality is mol/kg. The molefraction x i {\displaystyle x_{i}} is defined as the amount of a constituent n i {\displaystyle n_{i}} (in moles) divided
composition of a mixture in a dimensionless size; molefraction (percentage by moles, mol%) and volume fraction (percentage by volume, vol%) are others. When
are obtained from the definitions of the molalities and of the other compositional quantities. The molefraction of solvent can be obtained from the definition