Amount of substances that contains the same number of particles (atoms, molecules, formula units, ions) as the are atoms in exactly in 12 g of C-12.
1 mol contains 6.023 x1023 particles
6.023 x 1023 is known as Avogadro's number (NA)
http://extracredit-themolecalculator.blogspot.com/
Another concept map for mole conversion:
From Matriculation Chemistry (6th Edition) by Oriental Academic Publication (OAP), 2013.
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