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Moley, moley, mole…

Moley, moley, mole…. Objective: SWBAT perform stoichiometric conversions from mole to mass, from mass to mass Catalyst: What is .25 of a dozen? If a dozen hotdogs weighs 3 kilograms, how much does 3 dozen hotdogs weigh?. Agenda. Catalyst OMG! YOUR NEW BFFL! The mole.

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Moley, moley, mole…

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  1. Moley, moley, mole… • Objective: • SWBAT performstoichiometric conversions from mole to mass, from mass to mass • Catalyst: • What is .25 of a dozen? • If a dozen hotdogs weighs 3 kilograms, how much does 3 dozen hotdogs weigh?

  2. Agenda • Catalyst • OMG! YOUR NEW BFFL! The mole. • Bring back the train tracks • Exit Question

  3. What is a mole to us chemists? • A benign overgrowth of cells because of a failure in mitosis? • NO! But gross… • A rascly little rodent? • NOOOO! • A TV show featuring celebrities? • NOOOOO! • Then WHAT IS IT?????!!!???!?!?!???!!!!

  4. The Mole Think of the term “a dozen”… How many donuts are in a dozen? How many eggs are in a dozen?

  5. The Mole Just like a dozen refers to 12 objects…

  6. The Mole Just like a dozen refers to 12 objects… … the mole refers to …

  7. The Mole Just like a dozen refers to 12 objects… … the mole refers to … 6.02 x 1023 particles

  8. The Mole This number is called Avogadro’s number… 6.02 x 1023602,000,000,000,000,000,000,000

  9. ATTENTION! ATTENTION! • Today’s goal is for you to learn how to “Set-up” these problems. Therefore, even if you do not have a calculator you need to make sure that you set-up the problems in your notes.

  10. What’s the point of all this? • Key Point #1: Avogadro's number is used to convert between grams, moles, and atoms/molecules. • It all relates back to the mole… • Guess what’s coming back…

  11. TRAIN TRACKS!!! • Step 1: • What to what? • Step 2: • Write conversion factor(s) • Step 3: • Train tracks

  12. Avogadro’s Number Conversion factor: 1 mol = 6.02 x 1023 atoms 1 mol = 6.02 x 1023 molecules 1 mol of pennies = ? You may want to copy this down…hint hint cough cough

  13. Avogadro’s Number 1 mol = 6.02 x 1023 atoms How many atoms are in .25 mol N2?

  14. Avogadro’s Number 1 mol = 6.02 x 1023 atoms How many atoms are in .25 mol N2? .25 mol N2

  15. Avogadro’s Number 1 mol = 6.02 x 1023 atoms How many atoms are in .25 mol N2? .25 mol N2 1 mol N2 6.02 x 1023 atoms I guess you can use your calculator for this…

  16. Scientific Notation on the calculator • If you need to type 6.02 * 1023 • Type “6.02 ‘EE’ 23” instead. • SAVE TIME AND LOOK COOL!

  17. Your turn! Whiteboards. How many atoms are in 2 moles of C12H22O11?

  18. OOOH, I want some more train tracks! • Key Point #2: • Molar mass is the total mass in one mole of a substance. • 1 mol X = ____ g X • BUT HOW DO WE FIND THE MASS??? • 1 mol Oxygen = 16 g • 1 mol of He = ?

  19. Molar Mass 1 mol C =

  20. Molar Mass 1 mol C = 12 g C

  21. Molar Mass 1 mol Na =

  22. Molar Mass 1 mol Na = 23 g Na

  23. Molar Mass-Can you figure out this one?? 1 mol CO2 =

  24. Molar Mass 1 mol CO2 = C = 12 g O = 16 g O = 16 g

  25. Molar Mass 1 mol CO2 = C = 12 g + O = 16 g + O = 16 g

  26. Molar Mass 1 mol CO2 = 44 g CO2 C = 12 g + O = 16 g + O = 16 g

  27. Molar Mass 1 mol KNO3 = K = + N = + O =

  28. Molar Mass 1 mol KNO3 = K = 39 g + N = 14 g + (3) O = 16 g

  29. Molar Mass 1 mol KNO3 = 101 g K = 39 g + N = 14 g + (3) O = 16 g

  30. Molar Mass- Let’s try a problem 1 mol KNO3 = 101 g If we have 3.5 moles of KNO3, how many grams would we have? WHAT to WHAT?

  31. Molar Mass 1 mol CH4 = If we have 20 grams CH4, how many moles of CH4 do we have?

  32. Step yo’ game up! • How many atoms are there in 14 grams?

  33. Independent Practice • 1, 11, 16… we will go over to show you how to solve this hilarious assignment! • Attach your work on a separate sheet of paper.

  34. Exit Question • How many molecules are in a mole of NH4? • How many grams are there in 2.3 moles of NH4?

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