The mole

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First Something Familiar

• What do the following items have in common?

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What common traits did you notice?
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Now, Something Not Familiar

• What do the following items have in common?
• Use your note-taking template to list some common
  traits for the examples you see

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Examples of the Mole
32 grams of Sulfur
201 grams of Mercury
12 grams of carbon
55.8 grams of Iron
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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 mass in 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 mass of 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.