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# 11 29 How Many Moles Part Ii

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• 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. Launch 11/30 1.  Calculate the molecular mass of H2 (include units!).
• 3. Launch 11/30 2.  Calculate the molecular mass of NO3 (include units!).
• 4. Launch 11/30 3.  Calculate the molecular mass of Mg(ClO2)2 .
• 5. Announcements   Quiz on Friday   The mole   Conversions   Unit exam in 2 weeks   Block 5 earned the party this Friday
• 6. How many moles? - Part II Mr. Heffner 11/30/09
• 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. 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. 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. 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. 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. 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. 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. 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. 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. Foldable   Define the following terms:   Mole   Avogadro’s number   Molecular mass   Conversion factor   Starting unit
• 17. Practice Questions   Practice question worksheet
• 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. 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. 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. 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. 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. Homework   Finish practice questions