Avogadro number - Number of atoms in 12g of carbon-12 / 6.02 x 10 23, Mole calculation of a compound - Mass divided by formula mass, Formula mass - Total mass number of the elements of a compound, 12g - Mass of 1 mole of Carbon, 71g - Mass of 1 mole of chlorine (Cl 2 ) molecules, 2 moles - 8g of Helium, 18 - Formula mass of water,

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