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Chemistry 20 Online
OpenStudy (anonymous):

a mole is an SI base unit that describes what?

OpenStudy (anonymous):

Mole is a unit of measurement used in chemistry to express amounts of a chemical substance, defined as the amount of any substance that contains as many elementary entities as there are atoms in 12 grams of pure carbon-12, the isotope of carbon with relative atomic mass of exactly 12 by definition.

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