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A mole is the amount of pure substance containing the same number of chemical units as there are atoms in exactly 12 grams of carbon-12 (i.e., 6.023 X 10^23).
Added 12/22/2014 2:14:23 AM
This answer has been confirmed as correct and helpful.
Confirmed by
jeifunk [12/22/2014 2:34:28 AM]