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Give an account of the ‘mole concept’. 

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Mole is a unit to express amount of any chemical compound that contains atoms/molecules/ions equal to atoms present in 12 gram of carbon-12 isotope. This number of atoms is fixed and is equal to 6.022 × 1023 (Avagadro’s number). Thus a mole expresses a collection of 6.022 × 1023 atoms, molecules, ions, etc. For e.g., 1 mole of oxygen atom refers to 6.022 × 1023 atoms of oxygen.

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