Avogadro's law

         (1) In accordance to this law, Equal volumes of any two gases at the same temperature and pressure contain the same number of molecules.

         Thus,       (at constant T and P)

         or V = Kn         (where K is constant)

         or 

Example,

         (2) One mole of any gas contains the same number of molecules (Avogadro's number = 6.02 * 10²³) and by this law must occupy the same volume at a given temperature and pressure. Volume of one mole of the gas is called as molar volume, V_m which is 22.4 L mol^-1 at standard temperature pressure or normal temperature pressure.

         (3) This law can also be stated as the molar gas volume at a given temperature and pressure is a specific constant independent of the nature of the gas.

         Thus, V_m = specific constant = 22.4 L mol^-1 at Standard temperature pressure or Normal temperature pressure

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