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What is a mole?

A mole is a name given to a certain number of particles. Amounts of various substances are measured in a unit known as the mole (known as mol for short, symbol n). 

One mole is approximate 6.02 x 1023 particles (this number is known as the Avogadro constant, NA)

Number of moles  = Number of particles you have ÷ Number of particles in a mole

For example: I have 1.5 x 1024 C atoms - how many moles of carbon do I have? 

Number of moles = (1.5 x 1024) ÷ (6.02 x 1023)

                            = 2.49 moles

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