Molarity of a given solution is defined as the total no. of moles of solute per litre of solution. The molality of a solution is totally dependent on the changes in physical properties of the system like pressure and temperature as unlike mass, the volume of the system changes with the change in physical conditions of the system. Molarity is represented by M, that is termed as molar. One molar is the molarity of a solution where 1 gram of solute is dissolved in a litre of solution. As we know, in a solution, the solvent and solute blend to make a solution, thus, the total volume of the solution is taken.