In chemistry, we deal with substances which are composed of atoms, molecules or formula units. The counting of these particles is not possible for the chemists.the concept of Avogadro’s number facilitated the counting of particles contained in the given mass of a substance. Avogadro’s Number is a collection of 6.02 x 1023 particles.
It is represented by symbol ‘NA’. Hence, the 6.02 x 1023 number of atoms, molecules or formula units is called Avogadro’s number that is equivalent to one ‘mole’ of respective substance. In simple words 6.02 x 1023 particles are equal to one mole as twelve eggs are equal to one dozen.
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To understand the relation between the Avogadro’s number and the mole of a substance let us consider a few examples.
Thus, 6.02 x 1023 atoms of elements or 6.02 x 1023 molecules of molecular substance or 6.02 x 1023 formula units of ionic compounds are equivalent to 1 mole.
For further explanation about number of atoms in molecular compounds or number of ions in ionic compounds let us discuss two examples:
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