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  • Physics


The mole is the legal (SI) unit of quantity of matter (symbol: mol). The contraction of "gram-molecule".
The quantity of matter in a system containing as many elementary entities as there are in 12g of carbon 12 atoms. (This number is called the Avogadro number = 6.022 x 1023)
Example: one mole of dihydrogen molecules contains 6.022 x 1023 molecules of dihydrogen.


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