A mole is defined as
1) the amount of substance containing the same number of chemical units as the number of atoms in exactly 12g of C-12
2) the amount of substance containing Avogadro's number of chemical units
3) the unit for expressing the amount of a substance

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2 only

1 only

3 only

all

answer is D.

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Detailed Solution

Mole is defined as the amount of substance containing the same number of chemical units as the number of atoms in exactly 12g of C-12, which is calculated to be 6.02 1023 (Avogadro’s number). So, we can also define a mole as the amount of substance containing Avogadro's number of chemical units. Now, as per the use of the word mole, we know that it is also defined as a unit for expressing the amount of a substance.

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