What is a mole?
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Transcript of What is a mole?
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What is a mole?• A mole is a quantity equal to the number of
atoms in exactly 12g of carbon-12. Remember that the relative atomic mass is always based on the
comparison of any atom to the carbon atom.
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I say dozen, you say…Molar Mass Dozar Mass
# of dozens
# of eggs
Mass of egg
Mass of dozen
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What is its symbol?
• Symbol: mol
• 12g of C-12 = 1 mol of C-12
• The Atomic mass of C-12 = 12 amu = 12g/mol
This is called the MOLAR MASS
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The molar mass of a substance is…?
…the mass of one mole of that substance.
Substance Relative Atomic Mass (amu)
Molar Mass (g/mol)
Carbon (C) C = 12.01 12.01
Neon (Ne) Ne = 20.18 20.18
Calcium (Ca) Ca = 40.08 40.08
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1 mole of CO2 has a mass of 44 amu…
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What is really in 1 mol?
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Avogadro’s number represents…
… The number of entities in 1 mol. – There are always 6. 02 X 1023 atoms or molecules
in 1 mol.
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1. Change 4.0 X 103 Na atoms to mass of sodium atoms.
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2. Change 55g of Ca(OH)2 to molecules of Ca(OH)2.
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Name Formula
Beryllium Chloride BeCl2
Diphsphorous pentoxide P2O5
Sodium carbonate Na2CO3
Magnesium nitride Mg3N2
Sulfur trichloride SCl3
Iron (2) phosphate Fe3(PO4)2
Calcium nitrate Ca(NO3)2
Aluminum sulfide Al2S3
Lead (4) fluoride PbF4
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Complete Part B on your own