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AQA AS CHEMISTRY CHEM1 NOTES

Amount of Substance

The Mole

Definition of a mole: The amount of substance that contains as many particles as there are in
12g of carbon-12 atoms.

Can also be described using Avogadro's constant - 6.023 X 1023 (this does not need to be
remembered)

MR…

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Formulas, Yield, Atom Economy

Empirical Formula = Smallest whole number ratio of atoms of each element in a
compound

Molecular Formula = Actual number of atoms of each element in a compound

Eg: Hexane ­ Molecular Formula = C6H14
Empirical Formula = C3H7 (divided by 2)

Percentage Yield = Actual…

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