The easiest way of counting how many particles there are in a substance is to find its mass. There are 6.02 x 1023 atoms in 12g of carbon-12. It follows that if a magnesium-24 atom is twice the mass of a carbon-12 atom then there are 6.02 x 1023 atoms in 24g of magnesium-24.The mole is the unit of amount of substance. One mole contains 6.02 x 1023 particles and this number is called the Avogadro constant and is given the symbol NA.
Counting Atoms - The Mole
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Specification: Edexcel Chemistry (8CH0), AS-level, Topic 5: Formulae, Equations and Amounts of Substance. Topic: Amount of Substance and Calculations.
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