the mole
TRANSCRIPT
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Chemists use the idea of the mole when comparing the number of particles of different substances.
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How many atoms are there in 12 g of carbon (one mole)?
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This is the number of atoms in 12 g of carbon or one mole of particles.
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It is called the Avogadro constant.
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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.
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12 g of carbon contains 1 mole of carbon atoms, or 1 mol for short.
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How many moles of sulphur atoms are there in 32 g of sulphur?
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Notice that the mass of one mole is the equal to the relative atomic massin grams.
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So, how many moles of iron atoms are there in 56 g of iron?
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If you know the Ar or Mr of a substance, you can easily work out the massof one mole of that substance.
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This is the relationship between moles, grams and molar mass.
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This ‘magic triangle’ might help you in calculations.
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What is the amount in moles of carbon atoms in 6 g of carbon?
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The mass is grams in 6.
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The Ar of carbon is 12 so its molar mass is 12 g mol-1.
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There are 0.5 mol of carbon atoms in 6 g of carbon.
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This is the relationship between moles, grams and molar mass.
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This ‘magic triangle’ might help you in calculations.
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What is the mass of 2 moles of calcium carbonate, CaCO3?
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The Mr of calcium carbonate is 100 so its molar mass is 100 g mol-1.
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The amount in moles is 2.
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2 moles of calcium carbonate, CaCO3, have a mass of 200 g.