What is a mole?
A mole is the amount of a substance which contains as many particles (atoms, ions, molecules etc) of the substance as there are carbon atoms in 12g of 12C - this is exactly 6.02 × 1023 atoms. This formula is known as the Avogrado number. The mass in grams of any element is equal to its relative atomic mass - for example, one mole of Calcium is approximately 40g.
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What is a mole?