1.

A mole is define so A) the amount of substance containing the same number of chemical units as the number of atoms in exactly 12g of C^(12) B) the amount of substance containing Avogadro number of chemical units C) the unit for expressing amount of a substance

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The amount of SUBSTANCE CONTAINING the same number of chemical units as the number of ATOMS in exactly 12G of `C^(12)`
The amount of substance containing Avogadro number of chemical units
The unit for expressing amount of a substance
All the above

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