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# The mole

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### The mole

1. 1. Chemists use the idea of the mole when comparing the number of particles ofdifferent substances.
2. 2. How many atoms are there in 12 g of carbon (one mole)?
3. 3. This is the number of atoms in 12 g of carbon or one mole of particles.
4. 4. It is called the Avogadro constant.
5. 5. If you started counting 220 million carbon atoms per second 85 million years ago,you might just have finished counting a mole of them about now.
6. 6. 12 g of carbon contains 1 mole of carbon atoms, or 1 mol for short.
7. 7. How many moles of sulphur atoms are there in 32 g of sulphur?
8. 8. Notice that the mass of one mole is the equal to the relative atomic massin grams.
9. 9. So, how many moles of iron atoms are there in 56 g of iron?
10. 10. If you know the Ar or Mr of a substance, you can easily work out the massof one mole of that substance.
11. 11. This is the relationship between moles, grams and molar mass.