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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. Other Names Related to Molar Mass Molecular Mass: If you have a single molecule, mass is measured in amu’s instead of grams. The molecular mass is the same numerical value as 1 mole of molecules, only the units are different - grams and not amu’s. (This is the beauty of Avogadro’s Number!) Formula Mass: Same goes for ionic compounds. But again, the numerical value is the same, only the units are different.

  6. 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

  7. “Disorder in the American Courts”These are statements people actually said in court, word for word, taken down and now published by court reporters. ATTORNEY:  How can you be so sure, Doctor? WITNESS:      Because his brain was sitting on my desk in a jar. ATTORNEY:   I see, but could the patient have still been alive, nevertheless? WITNESS:      Yes, it is possible that he could have been alive and practicing law.

  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 = 80.9 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 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 1 mol H2 2.02 g H2 :Question #1 How many moles of H2 are in 100.0 g of H2? # mol H2 = 100.0 g H2 = 49.50 mol H2

  19. x 1 mol CuSO4 159.62 g CuSO4 Question #2 300.0 g of CuSO4 is needed in an experiment. How many moles does this represent? # mol CuSO4 = 300.0 g CuSO4 = 1.879 mol CuSO4

  20. x 143.32 g AgCl 1 mol AgCl Question #3 A chemical reaction requires 23.78 moles of silver chloride. How many grams is this? # g AgCl = 23.78 mol AgCl = 3408 g AgCl

  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. Hittite 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 = 3.0 mol S Number of moles of S in 1.8 x 1024 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

  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. #1 Page 9 x 6.02 x 1023 molecules 1 mol 4.50 mol = 2.71 X 1024 molecules Number of atoms in 4.50 moles to molecules

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

  29. 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 or particles Convert particles of a chemical to moles or grams Convert particles to grams by going through the mole or the opposite direction.

  30. 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 through MOLES.

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

  32. 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)

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

  34. I Would Not Suggest Sleep Walking….

  35. x 6.02 x 1023 molecules 1 mol H2O x 1 mol H2O 18.02 g H2O Question How many molecules are in 73 grams H2O? # H2O molecules = 73 g H2O = 2.4 x 1024 molecules H2O

  36. Atoms/Molecules to Grams x 6.02 x 1023 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 or particles Convert particles of a chemical to moles or grams Convert particles to grams by going through the mole or the opposite direction.

  40. Hittite 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 2.94 x 1024 atoms of O How many atoms of O are present in 78.1 g of oxygen?

  42. Learning Check for Quiz Tomorrow Prozac, C17H18F3NO, is a widely used antidepressant that inhibits the uptake of serotonin by the brain. What is its molar mass? Add the molar masses of 17 C, 18 H, 3 F, 1 N, 1 O 309.36 g/mol

  43. x 1 mol Fe x 1 mol Fe 6.02 x 1023 mc Learning Check #1! What is the mass (in grams) of 1.806 X 1024 molecules of Fe? 1.806 x 1024 mc Fe 55.85 g Fe = 167.6 g Fe

  44. x 6.02 x 1023 mc MgCl2 1 mol MgCl2 x 1 mol MgCl2 95.21 g MgCl2 Learning Check #3! How many molecules of MgCl2 are present in 380.84 g of MgCl2? 380.84 g MgCl2 = 2.4080 x 1024 molecules of MgCl2

  45. 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

  46. x 1 mol H2O 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

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