1.27: Know that the Mole (Mol) is the Unit for the Amount of a Substance

MOLE: Measure of the amount of a substance

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• One Mole (1 Mol) is the amount of a substance that contains 6 x 1023 particles (Atoms, molecules or formulae) of the substance (6 x 1023 is known as the Avogadro Number

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Example:

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1 Mol of Sodium (Na) contains  6 x 1023  Atoms of Sodium

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1 Mol of Hydrogen (H2) contains  6 x 1023  Molecules of Hydrogen

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1 Mol of Sodium Chloride (NaCl) contains  6 x 1023  Formulae of Sodium Chloride