Download - Section 3.1 The Mole and Molar Mass
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Section 3.1 The Mole and Molar Mass
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The Mole and Molar Mass
In this section…
a. Connecting the atomic and real worlds
b.The mole
c. Elemental molar mass
d.Compound molar mass
e.Conversions between atoms, moles, and mass
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How do we relate atoms and molecules to the real world?
1 “mole” of atoms or molecules fills a small handful.
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1 mole = 6.02 x 1023 atoms or molecules
1 mole of Cu, Al, S, K2Cr2O7, H2O and CuCl22H2O
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1 mole = 6.02 x 1023 atoms or molecules
1 mole of elements Cu, Al, S,
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1 mole = 6.02 x 1023 atoms or molecules
1 mole compounds K2Cr2O7, H2O and CuCl22H2O
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The mole as a conversion factor
1 mol element = 6.02 x 1023 atoms of that element
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The mole as a conversion factor
1 mol element = 6.02 x 1023 atoms of that element
moles atoms
atoms moles
1.95 mol Al
4.68 x 1023 Cu atoms
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The mole as a conversion factor
1 mol element = 6.02 x 1023 atoms of that element
moles atoms
atoms moles
When doing these calculations,does it matter which elementis used?
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Elemental molar masselemental molar mass = mass of 6.02 x 1023 atoms
elemental molar mass = atomic weight on periodic table, in grams per mole
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Molar mass
1 mol Al =
1 mol F =
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Molar mass as a conversion factor1 mol Al = molar mass Al = 26.98 g Al
moles grams
1.95 mol Al1.95 mol Al
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Molar mass as a conversion factor1 mol Cu = molar mass Cu = 63.55 g Cu
grams moles
49.4 g Cu49.4 g Cu
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Compound molar masscompound molar mass = mass of 6.02 x 1023 molecules
compound molar mass = sum of atomic weights of atoms in the molecule
SO2
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Converting between grams and moles for a compound
Step 1. Determine molar massStep 2. Use molar mass as a conversion factor
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Molar mass as a conversion factor
moles grams
What is the mass of a 1.45 mol sample of SO2?
grams moles
What amount, in moles, of SO2 does a 212-g sample represent?
SO2 = 64.06 g/mol
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Multistep ProblemsHow many oxygen atoms are present in a 212-g sample of SO2?
Problem Map: