1. Measuring matter The mole
Ch. 10 Section 1
Measuring matter
The mole
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2. How do you measure matter?
By mass
By volume
By counting: specific units
Pair
Dozen
Baker’s dozen
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3. Mole “mol” Counting unit used for atoms
Italian scientist Amedeo Avogadro di Quaregna (1776–1856) who helped clarify the difference between atoms and molecules.
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4. Mole
6.02x1023 particles = 1 mole
1 mole contains Avogadro’s number of particles (6.02 × 1023)
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5. Particles – moles conversion
A) Obtain the number of sucrose molecules contained in 3.50 mol of sucrose.
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6. Particles – moles conversion
B) How many particles of zinc are contained in 2.50 mol of zinc?
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7. Particles – moles conversion
C) How many particles of silver nitrate are there in 3.25 of silver nitrate?
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8. Particles – moles conversion
D) How many moles of aluminum are equivalent to 5.75x1024 atoms of aluminum?
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9. Particles – moles conversion
E) There are 2.50x1020 atoms of iron. How many moles are equivalent to this amount?
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10. Chapter 10 Section 2 and 3
Mass of a mole
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11. Molar mass Mass of 6.02x1023 particles
average atomic mass or molar mass
Ionic compounds: “formula weight”
Covalent compounds: “molecular weight”
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12. Molar mass of an elementC Mg Fe
12.01 g/mol
24.31 g/mol
58.85 g/mol
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13. How is the molar mass of a compound determined?
Add together atomic mass of all atoms in compound
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14. Molar mass of NaCl 1 Na x 22.99 g/mol 1 Cl x 35.5 g/mol 23.0 g/mol
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15. Molar mass of water H2O Add atomic masses 2 H x 1.01 g/mol
1 O x 16.0 g/mol
2.02 g/mol
g/mol
18.02 g/mol
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16. Molar mass of sugar C6H12O6 Add atomic masses 6 C x 12.01 g/mol
12 H x g/mol
6 O x 16.0 g/mol
72.06 g/mol
12.12 g/mol
g/mol
g/mol
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17. Moles-Mass conversion
A) What is the mass in grams of 3.00 mol of NaCl?
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18. Moles-Mass conversion
B) What is the mass of 9.45 mol of aluminum oxide (Al2O3)?
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19. Moles-Mass conversion
C) Calculate the mass in grams of 2.50 mol of Fe(OH)2
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20. Moles-Mass conversion
D) How many moles are contained in 92.2 g of iron (III) oxide? (Fe2O3)
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21. Moles-Mass conversion
E) How many moles are contained in g of calcium chloride? (CaCl2)
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22. Empirical and Molecular formulas
Ch. 10 Section 4
Empirical and Molecular formulas
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23. Ch. 10 Section 5
Hydrates
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