The methods of determination of the molecular mass

         The following methods are taken in the use to determine the molecular mass,

         (i) Diffusion method (For gases) : The ratio of rates of diffusion of two gases is inversely proportional to the square root of their molecular masses.

         (ii) Vapour density method (For gases only) : Mass of a fixed volume of the vapour is compared with the mass of the same volume of hydrogen under the same conditions. The ratio of these masses is called as Vapour density or Relative density.

            Molecular mass = 2 * Vapour Density 

         (iii) Victor Meyer method (For the volatile liquids and solids)

This is based on the Dalton's law of partial pressure and Avogadro's hypothesis (gram molar volume).

         22400 ml of vapours of a substance = Molecular mass of that substance

         (iv) Colligative property method (For the non-volatile solids)

Discussed in the colligative properties of solutions.

         The average atomic mass and the molecular mass

         Where  A₁, A₂, A₃.........  are atomic mass of species 1, 2, 3,.... etc. with % ratio as X₁, X₂, X₃....... etc. Similar terms are for molecular masses. 

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