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# Lecture 10.2a- Mole Mass Conversions

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Section 10.2 lecture (part A) for Honors & Prep Chemistry

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• These aluminum satellite dishes at the National Radio Astronomy Observatory near Soccoro, New Mexico are naturally protected from corrosion by the formation of a thin film of aluminum oxide (Al 2 O 3 ).
• Rust weakens an iron chain.
• ### Lecture 10.2a- Mole Mass Conversions

1. 1. Bellwork- An argument for recycling <ul><li>An aluminum can contains 0.5 moles of aluminum metal. </li></ul><ul><li>How many particles are in the aluminum can? </li></ul><ul><li>How much does one mole of aluminum weigh? </li></ul><ul><li>What is the mass of the can? </li></ul>
2. 2. Converting between moles and number of particles involves multiplying or dividing by 6.02 x 10 23
3. 3. Converting between moles and mass involves multiplying or dividing by the molar mass of the substance
4. 4. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh?
5. 5. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg
6. 6. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg X
7. 7. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg X 24.305 grams 1 mole Mg
8. 8. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg X 24.305 grams 1 mole Mg = 91.1 grams Mg
9. 9. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg X 24.305 grams 1 mole Mg = 91.1 grams Mg WHERE THE HECK DID THIS COME FROM?!?
10. 10. Convert from moles to mass How much does 3.75 moles of magnesium metal weigh? 3.75 moles Mg X 24.305 grams 1 mole Mg = 91.1 grams Mg WHERE THE HECK DID THIS COME FROM?!?  The periodic table!
11. 11. 10.5 Moles to grams 9.45 mol Al 2 O 3 x ___________ = 964g Al 2 O 3 1 mol Al 2 O 3 102g Al 2 O 3 2 Al = 54g 3 O = 48 g 102g
12. 12. Grams to moles
13. 16. Mole Review huge # of particles  6 x 10 23  6 x 10 23 (g) grams (mass) molar mass molar mass   Use the periodic table! Use the mole banner!
14. 17. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>
15. 18. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms
16. 19. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms
17. 20. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms = 4 moles As
18. 21. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms = 4 moles As
19. 22. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms = 4 moles As X 74.9 grams 1 mole
20. 23. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>X 1 mole 6.02x10 23 atoms = 4 moles As X 74.9 grams 1 mole
21. 24. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>= 299.6 grams of Arsenic X 1 mole 6.02x10 23 atoms = 4 moles As X 74.9 grams 1 mole
22. 25. Convert from number of particles to mass in grams <ul><li>2.4 x 10 24 atoms of As </li></ul>= 299.6 grams of Arsenic ≈300g for multiple choice X 1 mole 6.02x10 23 atoms = 4 moles As X 74.9 grams 1 mole
23. 26. <ul><ul><li>1. Calculate the mass in grams of a sample containing 1.85 x 10 34 molecules of water. </li></ul></ul><ul><ul><ul><li>a. 3.07 x 10 10 g </li></ul></ul></ul><ul><ul><ul><li>b. 5.53 x 10 11 g </li></ul></ul></ul><ul><ul><ul><li>c. 188 g </li></ul></ul></ul><ul><ul><ul><li>d. 8.46 x 10 3 g </li></ul></ul></ul>10.2 Section Quiz.
24. 27. <ul><ul><li>2. Calculate the number of moles in a spoonful of table sugar (C 12 H 22 O 11 ) having a mass of 10.5 g. </li></ul></ul><ul><ul><ul><li>a. 32.6 mol </li></ul></ul></ul><ul><ul><ul><li>b. 3.59  10 3 mol </li></ul></ul></ul><ul><ul><ul><li>c. 3.07  10 –3 mol </li></ul></ul></ul><ul><ul><ul><li>d. 1.85  10 22 mol </li></ul></ul></ul>10.2 Section Quiz.