Define 1 mole and what is the value of mole
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The mole, symbol mol, is the SI unit of amount of substance. One mole contains exactly 6.022 140 76 × 1023 elementary entities. This number is the fixed numerical value of the Avogadro constant, NA, when expressed in mol−1, and is called the Avogadro number.
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Mole is the amount of substance of a system, which contains as many elementary entities as there are atoms in 12gm of carbon-12.
Mole is the SI unit of "Amount of Substance", and its symbol is "mol".
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