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the Mole !

It’s time to learn about. the Mole !. Stoichiometry: Conversions At the conclusion of our time together, you should be able to:. Convert a mole of a chemical to grams of that chemical Convert grams of a chemical to moles of that chemical. Interesting Photo:. Review of Molar Mass.

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the Mole !

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  1. It’s time to learn about . . . the Mole !

  2. Stoichiometry: ConversionsAt the conclusion of our time together, you should be able to: Convert a mole of a chemical to grams of that chemical Convert grams of a chemical to moles of that chemical

  3. Interesting Photo:

  4. Review of Molar Mass • The Mass of 1 mole (in grams) • Equal to the numerical value of the average atomic mass (use your periodic table, round to 2 places) 1 mole of C atoms = 12.01 g 1 mole of Mg atoms = 24.31 g 1 mole of Cu atoms = 63.55 g

  5. Molar Mass of Molecules and Compounds Mass in grams of 1 mole is equal numerically to the sum of the atomic masses 1 mole of CaCl2 = 1 mole Ca x 40.08 g/mol + 2 moles Cl x 35.45 g/mol = 110.98 g/mol CaCl2 1 mole of N2O4 = 92.02 g/mol N2O4

  6. I wonder if he ducked fast enough??

  7. Learning Check! • Molar Mass of K2O = ? g/mol 94.20 g/mol • MolarMass of antacid Al(OH)3 = ? g/mol 78.01 g/mol

  8. Calculations with Molar Mass molar mass Grams Moles

  9. Molar Mass as a Conversion Factor Molar Mass of the Compound 1 mole or 1 mole Molar Mass of the Compound Note that the molar mass could be that of an atom OR a molecule!

  10. Calculations with Molar Mass molar mass Grams Moles To convert Grams to Moles: x by 1 mole Molar Mass of the Compound

  11. Calculations with Molar Mass molar mass Grams Moles To convert Moles to Grams: x by Molar Mass of the Compound 1 mole

  12. Example of Converting Moles to Grams Aluminum is often used for the structure of light-weight bicycle frames. How many grams of Al are in 3.00 moles of Al? 3.00 moles Al ? g Al

  13. 1. Molar mass of Al1 mole Al = 26.98 g Al 2. Conversion factors for Al 26.98 g Al or 1 mol Al 1 mol Al 26.98 g Al 3. Setup3.00 moles Al x 26.98 g Al 1 mole Al Answer = 80.94 g Al

  14. What Do You Call Cheese That Isn't Yours? Nacho Cheese.

  15. Stoichiometry: ConversionsLet’s see if you can: Convert a mole of a chemical to grams of that chemical Convert grams of a chemical to moles of that chemical

  16. Learning Check! The artificial sweetener aspartame (Nutra-Sweet) formula C14H18N2O5 (MM = 294.34 g) is used to sweeten diet foods, coffee and soft drinks. How many moles of aspartame are present in 225 g of aspartame?

  17. x 1 mol C14H18N2O5 294.34 g C14H18N2O5 Learning Check! = 0.764 mol 225 g C14H18N2O5

  18. x 159.70 g Fe2O3 1 mol Fe2O3 :Question #1 7.8 moles of Fe2O3 # g Fe2O3 = 7.8 mol Fe2O3 = 1245.66 g Fe2O3

  19. x 1 mol K2SO4 174.27 g K2SO4 Question #4 120.8 g K2SO4 # mol K2SO4 = 120.8 g K2SO4 = 0.6932 mol K2SO4

  20. x 44.01g CO2 1 mol CO2 Question #3 1.22 moles of CO2 # g CO2 = 1.22 mol CO2 = 53.7 g CO2

  21. Stoichiometry: ConversionsAt the conclusion of our time together, you should be able to: Convert a mole of a chemical to particles of that chemical Convert particles of a chemical to moles of that chemical

  22. Red-Neck Innovations:

  23. Avogadro’s Number as a Conversion Factor 6.02 x 1023 particles 1 mole or 1 mole 6.02 x 1023 particles Note that a particle could be an atom OR a molecule!

  24. Example of Avogadro’s Number as a Conversion Factor x 1 mol S 6.02 x 1023 atoms S 1.8 x 1024 atoms S = 2.99 mol S Number of moles of S in 1.8 x 1024 S atoms a) 1.0 mole S atoms b) 3.0 mole S atoms c) 1.1 x 1048 mole S atoms

  25. Example of Avogadro’s Number as a Conversion Factor x 6.02 x 1023 atoms Al 1 mol Al 0.500 mol Al = 3.01 X 1023 atoms Al Number of atoms in 0.500 mole of Al a) 500 Al atoms b) 6.02 x 1023 Al atoms c) 3.01 x 1023 Alatoms

  26. Stoichiometry: ConversionsLet’s see if you can: Convert a mole of a chemical to particles of that chemical Convert particles of a chemical to moles of that chemical

  27. And you thought Chemistry was bad with factor-label problems!!??

  28. x 6.02 x 1023 molecules 1 mol Question #1 4.50 moles = ? molecules # molecules = 4.5 mol = 27.09 x 1023 molecules H2O = 2.7 x 1024 molecules H2O

  29. x 1 mole 6.02 x 1023 molecules Question #2 6.02 x 1024 molecules = ? moles # moles = 6.02 x 1024molecules = 1.00 x 101moles = 10.0 moles

  30. Stoichiometry: ConversionsAt the conclusion of our time together, you should be able to: Convert a mole of a chemical to particles or grams of that chemical Convert grams of a chemical to moles Convert particles of a chemical to moles Convert particles to grams by going through the mole or the opposite direction.

  31. Atoms/Molecules to Grams • Since 6.02 X 1023 particles = 1 mole and 1 mole = molar mass (grams) • You can convert atoms/molecules to moles and then moles to grams! (Two step process) • You can’t go directly from atoms to grams!!!! You MUST go thru MOLES.

  32. Calculations molar mass Avogadro’s numberGrams Moles particles Everything must go through Moles!!!

  33. Flowchart Atoms or Molecules Divide by 6.02 X 1023 Multiply by 6.02 X 1023 Multiply by atomic/molar mass from periodic table Moles Divide by atomic/molar mass from periodic table Mass (grams)

  34. An Easier Flowchart Moles Atoms or Molecules Mass (grams)

  35. I Would Not Suggest Sleep Walking….

  36. Atoms/Molecules to Grams x 6.02x1023 atoms Cu 1 mol Cu x 1 mol Cu 63.55 g Cu 35.4 g Cu = 3.35 X 1023 atoms Cu How many atoms of Cu are present in 35.4 g of Cu?

  37. Grams to Atoms/Molecules x 63.55 g Cu 1 mol Cu x 1 mol Cu 6.02 x 1023 atoms Cu 5.4 x 1023 atoms Cu = 57 g Cu How many grams of Cu are present in 5.4 x 1023 atoms of Cu?

  38. Familiar Saying Pulchritude does not extend below the surface of the derma. Beauty is only skin deep!!

  39. Stoichiometry: ConversionsLet’s see if you can: Convert a mole of a chemical to particles or grams of that chemical Convert grams of a chemical to moles Convert particles of a chemical to moles Convert particles to grams by going through the mole or the opposite direction.

  40. Red-Neck Innovations:

  41. Learning Check! 78.1 g O2 1 mol O2 6.02 X 1023molecules O2 2 atoms O 32.0 g O2 1 mol O2 1 molecule O2 1.57 x 1024 molecules of O2 2.94 x 1024 atoms of O How many molecules and atoms of oxygen are present in 78.1 g of oxygen?

  42. x 6.02 x 1023 atoms K 1 mol K x 1 mol K 39.10 g K Learning Check! How many atoms of K are present in 78.4 g of K? 78.4 g K = 1.21 x 1024 atoms of K

  43. x 1 mol C6H12O6 x 1 mol C6H12O6 6.02 x 1023 mc Learning Check! What is the mass (in grams) of 1.20 X 1024 molecules of glucose (C6H12O6)? 1.20 x 1024 mc C6H12O6 180.18 g C6H12O6 = 359 g C6H12O6

  44. x 6.02 x 1023 molecules 1 mol H2O x 1 mol H2O 18.02 g H2O Extra Review Mass-Mole-Molecules: Determine the number of molecules in 73 g of water # H2O molecules = 73 g H2O = 2.4 x 1024 molecules H2O

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