The quantity of solute in moles dissolved in 1 liter solution is called “molarity of solution”, denoted by “M”.
Molarity = Moles of solute /Mol. of sol in dm³ (L)
Molarity = mass in gm / mol.wt x vol of solution in (L)
The unit of molarity is mol/ dm³
The amount of solute in moles dissolved in 1kg solvent is called “molality” of solution denoted by “m”.
The unit of Molality is mol/kg.