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# 12 1 How Many Atoms

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• 1. Launch: 12/1   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 moles and atoms using Avogadro’s number as a conversion factor Tonight’s HW: Finish the back of the practice question worksheet
• 2. Launch 12/1 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
• 3. Launch 12/1 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
• 4. Announcements   Quiz on Friday   The mole   Conversions   Unit exam in 2 weeks
• 5. How many atoms? Mr. Heffner 12/1/09
• 6. Review: 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
• 7. How many atoms?   Avogadro’s number… ..or particles, or molecules   is equal to 6.02 X 1023 atoms/mol   can be used to convert between moles and atoms 6.02 X 1023 atoms 1 mole or 1 mole 6.02 X 1023 atoms ..or particles, or molecules
• 8. How many atoms?   There is a 3-step process for conversions: 1.  Write down the starting unit. 2.  Write the conversion factor with the starting units on the bottom. 3.  Cancel like terms and multiply across the top and bottom.
• 9. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #1: Write down the starting unit. 2 moles
• 10. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #2: Write conversion factor with the starting units on the bottom. 6.02 X 1023 atoms 2 moles X = 1 mole
• 11. Example #1 How many atoms are there in 2 moles of carbon (C)?   Step #3: Cancel like terms and multiply across the top and bottom. Ignore 6.02 X 1023 atoms 2 X 6.02 X 1023 atoms 2 moles X = 1 mole 1 +1 = 12.04 X 1023 atoms = 1.204 X 1024 atoms
• 12. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #1: Write down the starting unit. 1.5 moles
• 13. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #2: Write conversion factor with the starting units on the bottom. 6.02 X 1023 atoms 1.5 moles X = 1 mole
• 14. Example #2 How many atoms are there in 1.5 moles of CO2?   Step #3: Cancel like terms and multiply across the top and bottom. Ignore 6.02 X 1023 atoms 1.5 X 6.02 X 1023 atoms 1.5 moles X = 1 mole 1 = 9.03 X 1023 atoms
• 15. Example #3 How many moles are there in 3.01 X 1023 molecules of CO2?   Step #1: Write down the starting unit. 3.01X1023 molecules
• 16. Example #3 How many molecules are there in 1.5 moles of CO2?   Step #2: Write conversion factor with the starting units on the bottom. 1 mol 3.01X1023 molecules X = 6.02X1023 molecules
• 17. Example #3 How many molecules are there in 1.5 moles of CO2?   Step #3: Cancel like terms and multiply across the top and bottom. 1 mol 3.01 X 1 mol 3.01X1023 molecules X = 6.02X10 23 molecules 6.02 = .5 mol
• 18. Whiteboards   Work in pairs   Trade-off marker every question   You have 60 seconds to solve the question   Show all of your work!   Don’t forget units!   Lift board only when prompted
• 19. How many atoms are there in 1 mole of potassium (K)?
• 20. How many molecules are there in .5 moles of HCl?
• 21. How many moles of NO are there in 9.03 X 1023 particles?
• 22. How many moles of fluorine (F) are there in 12.04 X 1023 atoms?
• 23. Practice Questions   Practice question worksheet
• 24. Exit Slip 1.  What is Avogadro’s number? a.  6.02 X 1024 atoms b.  6.02 X 1023 atoms c.  3.01 X 1023 atoms d.  1.2 X 1024 atoms
• 25. Exit Slip 2.  Which of the following shows the correct way to calculate the number of atoms in 2 moles of O2? 32.00 grams a.  16 moles X 1 mole 1 mole b.  2 moles X 16.00 grams 1 atoms c.  2 moles X 6.02 X 1023 moles 6.02 X 1023 atoms d.  2 moles X 1 mole
• 26. Exit Slip 3.  How many atoms of sodium (Na) are in 1 mole? a.  3.01 X 1023 atoms b.  6.02 X 1023 atoms c.  12.04 X 1023 atoms d.  1.204 X 1024 atoms
• 27. Exit Slip 4.  How many molecules of C3OH are in .5 moles? a.  3.01 X 1023 molecules b.  6.02 X 1023 molecules c.  9.03 X 1023 molecules d.  1.204 X 1024 atoms
• 28. Exit Slip 5.  If there are 1.204 X 1024 particles of gold (Au), how many moles are there? a.  .5 moles b.  1 mole c.  2 moles d.  4 moles
• 29. Homework   Finish practice questions