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It is not practically possible to find the mass of a minute particle like an atom molecule so a collectn of 6.022*10 to the power 23 elementary particles called mole is taken.
mole is defined as amount of a substance containing elementary particles like atoms in 12 gram of carbon c-12
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A mole is the amount of substance which carries the same number of chemical units as there are atoms in exactly 12 g of carbon.
1mole of atom,molecule,particle or ion contains 6.022 × (10)^23 atoms
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