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# 11 29 How Many Moles Part Ii

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### 11 29 How Many Moles Part Ii

1. 1. Launch: 11/30   Grab your binder and immediately take a seat!   Place homework (practice questions), binder paper, and a pen/pencil on your desk. Today’s Objective: I can convert between grams and moles using molecular mass as a conversion factor Tonight’s HW: Finish practice question worksheet
2. 2. Launch 11/30 1.  Calculate the molecular mass of H2 (include units!).
3. 3. Launch 11/30 2.  Calculate the molecular mass of NO3 (include units!).
4. 4. Launch 11/30 3.  Calculate the molecular mass of Mg(ClO2)2 .
5. 5. Announcements   Quiz on Friday   The mole   Conversions   Unit exam in 2 weeks   Block 5 earned the party this Friday
6. 6. How many moles? - Part II Mr. Heffner 11/30/09
7. 7. How many moles?   Molar mass   used to convert between grams and moles   units = grams/mole   can be shown as a fraction Molar mass of H2 = 2.02 g/mol 2.02 grams 1 mole or 1 mole 2.02 grams
8. 8. How many moles?   There is a 3-step process: 1.  Write down the starting unit. 2.  Calculate molecular mass and turn it into a conversion factor with the starting units on the bottom. 3.  Cancel units and multiply across the top and bottom.
9. 9. Example #1: mol  g How many grams of H2 are there in 2 moles of H2?   Step #1: Write down the starting unit. 2 moles
10. 10. Example #1: mol  g How many grams of H2 are there in 2 moles of H2?   Step #2: Calculate molecular mass and turn it into a conversion factor with the starting units on the bottom. 2.02 grams 2 moles X = 1 mole
11. 11. Example #1: mol  g How many grams of H2 are there in 2 moles of H2?   Step #3: Cancel units and multiply across the top and bottom. 2.02 grams 2 X 2.02 grams 2 moles X = 1 mole 1 = 4.04 grams units!
12. 12. Example #2: g  mol How many moles of CO are there in 14.00 grams of CO?   Step #1: Write down the starting unit. 14.00 grams
13. 13. Example #2: g  mol How many moles of CO are there in 14.00 grams of CO?   Step #2: Calculate molecular mass and turn it into a conversion factor with the starting units on the bottom. 1 mole 14.00 grams X = 28.01 grams
14. 14. Example #2: g  mol How many moles of CO are there in 14.00 grams of CO?   Step #3: Cancel units and multiply across the top and bottom. 1 mole 14.00 X 1 mole 14.00 grams X = 28.01 grams 28.01 = ~.5 moles units!
15. 15. Partner Teaching   Partner A teaches Partner B   Partner A writes and narrates   Partner B listens   Partner B completes the problem on own paper   Switch! 1.  How many moles of O2 are there in 64.00 grams of O2? 2.  How many grams of NO2 are there in 4 moles of NO2?
16. 16. Foldable   Define the following terms:   Mole   Avogadro’s number   Molecular mass   Conversion factor   Starting unit
17. 17. Practice Questions   Practice question worksheet
18. 18. Exit Slip 1.  What is the molar mass of Al(OH)3? a.  43.99 g/mol b.  78.01 g/mol c.  300.03 g/mol d.  303.00 g/mol
19. 19. Exit Slip 2.  Which of the following is not a correct way to represent the molecular mass of CH4? 16.05 moles a.  1 gram 16.05 grams b.  1 mole c.  1 mole 16.05 grams d.  16.05 g/mol
20. 20. Exit Slip 3.  Which of the following shows the correct way to calculate the number of moles in 16.00 grams of O2? 32.00 grams a.  16.00 moles X 1 mole 1 mole b.  16.00 grams X 16.00 grams 1 mole c.  16.00 grams X 32.00 grams 16.00 grams d.  16.00 moles X 1 mole
21. 21. Exit Slip 4.  How many grams of NH3 are there in 2 moles of NH3? a.  1.00 moles b.  14.01 grams c.  17.04 grams d.  34.08 grams
22. 22. Exit Slip 5.  How many moles of N2 are there in 14.01g of N2? a.  .5 moles b.  2 mole c.  14.01 moles d.  28.02 moles
23. 23. Homework   Finish practice questions
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