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Hi Kundan,
The Mole is the unit of measurement in International System Unit(SI) for amount of substance. 1 Mole is just a number whose value is equal to the Avagadro’s number i.e. 6.022 * 10 23 . So, when someone claims of a matter to be of 1 mole in quantity, that implies that the matter under consideration contains exactly 6.022 * 10 23 number of particles (atoms, molecules, ions, electrons or any other elementary entities). Hope this helps.
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For mole concept , you should refer NCERT book of chemistry . it give very elaborate way with discriptive. And op tandon as well.
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