The Mole!

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The Mole!
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Why We Use The Mole

• Chemists work in the macroscopic world of grams
  and liters
• But chemists are also interested in the
  microscopic world of atoms and molecules which
  are VERY, VERY small
• The mole is the bridge from the microscopic world
  to the macroscopic world

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• 1 Mole
• 6.02 X 1023

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24 cans 1 case
2 shoes, earrings, mittens 1 pair
12 donuts, roses, eggs 1 dozen
6.02 X 1023 molecules, atoms, ANYTHING 1 mole
Moles are used to tell us the amount of any
substance.
1 mole Na 6.02 X 1023 atoms of Na 1 mole Cl
6.02 X 1023 atoms of Cl 1 mole NaCl 6.02 X 1023
molecules of NaCl 1 mole of donuts 6.02 X 1023
donuts
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• E.g. The average galaxy has 150 billion stars. It
  is estimated that there are 125 billion galaxies
  in the universe. How many moles of stars in the
  universe?

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• E.g. It is estimated that there are 200 million
  insects per person. There are approximately 7
  billion people in the world. How many moles of
  insects are there in the world?

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Practice

• Holy Moley Activity
• P. 168 1-6
• The Great Mole Hunt (tomorrow)