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Empirical Formulas and Molar Mass:
Part 2-Mass, Atoms, Moles
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Objectives
• -Be able to use atomic mass to relate grams, moles and atom number
• -Determine the number of atoms, moles, and grams of different substances
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Mass, Atoms, Moles
• KC4H5O6 is the empirical formula for cream of tartar
• How many atoms of oxygen are in 1 formula unit of cream of tartar?
6 atoms O
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Mass, Atoms, Moles
• KC4H5O6
• How many atoms are in 1 formula unit of cream of tartar?
16 atoms
1 potassium4 carbon5 hydrogen6 oxygen
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Mass, Atoms, Moles
• KC4H5O6 • How many formula units are in 1
mole of cream of tartar? 6.02 x 1023 formula units
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Mass, Atoms, Moles
• KC4H5O6 • How many atoms of oxygen are in
(PER) 1 mole of cream of tartar?• ? atoms O/mole KC4H5O6 =
6 atoms O x 6.02 x1023 formula unit KC4H5O6 1 formula unit KC4H5O6 1 mole KC4H5O6
=3.61 x 1024 atoms O/mole KC4H5O6 6
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Mass, Atoms, Moles
• KC4H5O6
• How many moles of oxygen atoms are in 1 mole of cream of tartar?
• Let’s put this in perspective……….
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How many wheels are in a dozen bicycles?
1 bicycle = 2 wheels1 dozen bicycles = 2 dozen wheels
1 mole bicycles = 2 mole wheels8
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How many dozen hydrogen atoms are in 1 dozen water molecules?
1 water = 2 hydrogen1 dozen water = 2 dozen hydrogen1 mole water = 2 mole hydrogen
H2O9
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Mass, Atoms, Moles
• So………• KC4H5O6 • How many moles of oxygen atoms
are in 1 mole of cream of tartar?
6 moles O
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Mass, Atoms, Moles
• KC4H5O6 • What is the mass of the oxygen
atoms in (PER) 1 mole of cream of tartar?
? g O/ mole KC4H5O6
16.0 g O x 6 moles O x = 96.0 g O1 mole O 1 mole KC4H5O6 mole
KC4H5O6 11
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Let’s Do It!!!
• How many atoms in one formula unit?
Magnesium Acetate: Mg(C2H3O2)2
1-Mg4-C6-H4-O
15 total atoms12
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Let’s Do It!!!
• How many formula units in one mole of
Magnesium Acetate: Mg(C2H3O2)2
6.02 x 1023 formula units
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Let’s Do It!!!!
• How many oxygen atoms are in one formula unit?
Magnesium Acetate: Mg(C2H3O2)2
4 oxygen atoms
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Let’s Do It!!!• How many oxygen atoms are in one
mole of this substance?
Magnesium Acetate: Mg(C2H3O2)2
? O atoms = mole Mg(C2H3O2)2
(4 O atoms) x (6.02 x 1023 units Mg(C2H3O2)2 ) =
unit Mg(C2H3O2)2 mole Mg(C2H3O2)2
= 2.41 x 1024 atoms O mole Mg(C2H3O2)2
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Let’s Do It!!!
• How many moles of oxygen atoms are in one mole of this
substance?Magnesium Acetate:
Mg(C2H3O2)2
4 moles of Oxygen16
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Let’s Do It!!!• What is the mass of oxygen atoms
in one mole of this substance? Magnesium Acetate: Mg(C2H3O2)2
? g O =1 mole Mg(C2H3O2)2
16.0 g O x 4 moles O 1 mole O 1 mole Mg(C2H3O2)2
= 64.0 g O/ 1 mole Mg(C2H3O2)2
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Objectives
• -Be able to use atomic mass to relate grams, moles and atom number
• -Determine the number of atoms, moles, and grams of different substances
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