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What is a Mole?

A mole is defined as the
number of atoms in exactly 12 grams of 12C (carbon twelve).
The number is called Avogadro's Number.

In the above definition, 12 is the mass number of carbon.
So, one mole of carbon atoms has a mass of 12 grams.

The relative atomic mass, which can be written as Ar or RAM,
is the number just above the element in the periodic table
(have a look, and check that carbon is 12).
If you don't know what "relative atomic mass" means,
see relative atomic mass in the atomic structure section.

What about elements other than carbon?

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