We have two sets of concentration terms:
(1) Molality, mole fraction, %w/w:
These deal with the moles or the mass of the solution and can be directly converted into each other as they do not involve the volume of the solution.
(2) Molarity, %w/v, Strength of the solution in g/ lit.
These deal with the moles or mass of the species and relate it to the volume of the solution. The terms in this set can be converted into each other.
However to convert the terms in the first and second set into each other, the density of the solution is required.