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Mole calculations
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Mole calculations

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  • 1. Using the mole for… CONVERSIONS
  • 2. CONVERSIONS
    • Must use the molar mass
    • Can go from:
      • # of atoms/molecules to moles
      • Moles to # of atoms/molecules
      • moles to grams
      • grams to moles
  • 3. SHORTCUTS for CONVERSIONS
    • Moles to atom/molecules
      • moles times 6.022 x 10 23
    • Atom/molecules to moles
      • # of atoms or molecules divided by 6.022 x 10 23
    • Moles to grams
      • moles times molar mass
    • Grams to moles
      • grams divided by molar mass
  • 4. mole island atom island gram island liter island Divide by 22.4L Mult by 22.4L Divide by molar mass Mult by molar mass divide by 6.022 x 10 23 Mult by 6.022 x 10 23
  • 5. Mole GRAMS LITERS # of atoms Divide by 6.022 x 10 23 X by 6.022 x 10 23 X by 22.4 liters Divide by 22.4 liters Divide by molar mass X by molar mass
  • 6. Sample problems
    • How many atoms of copper are found in 1.34 moles of copper?
    • We are on mole island, need to get to atoms island.
    • Multiply moles by 6.022 x 10 23
    • 1.34 x 6.022 x 10 23 =
    • 8.07 x 10 23 atoms of copper
  • 7.
    • How many moles does 1.23 x 10 23 molecules of CaCl 2 represent?
    • we are on atom/molecule island, need to get to mole island.
    • divide # of molecules by 6.022 x 10 23
    • 1.23 x 10 23 / 6.022 x 10 23 =
    • .20 moles of CaCl 2
  • 8.
    • How many grams are in 3.4 moles of I 2 ?
    • We are on mole island, need to get to grams island.
    • multiply # of moles by the molar mass
    • 3.4 x 253.8 =
    • 862.92 grams of I 2
  • 9.
    • How many moles does 134.7 grams of H 2 SO 4 equal?
    • We are on gram island, need to get to mole island.
    • divide # of grams by the molar mass
    • 134.7 / 98.08 =
    • 1.37 moles of H 2 SO 4
  • 10.
    • How much does 7.12 x 10 24 molecules of H 2 O weigh in grams?
    • We are on atoms/molecules island, need to get to gram island.
    • divide # of molecules by 6.022 x 10 23
    • then multiply by the molar mass
    • (7.12 x 10 24 /6.022 x 10 23 ) x 18.02 =
    • 213.06 grams of water
  • 11. HOMEWORK
    • 1. How many moles are found in a sample containing 6.02 x 10 24 atoms?
    • 2. If you have 1.28 x 10 22 molecules of HCl, how many moles do you have?
    • 3. 3.5 moles of gold would have how many atoms?
    • 4. If you had 12.3 moles of baking soda, how many molecules would it contain?
    • 5. A sample of NaCl weighing 1.25 grams contains how many molecules?
  • 12. MORE HOMEWORK
    • 6. Calculate the number of moles in a 15.3 gram sample of barium hydroxide.
    • 7. How many grams does 0.14 moles of silver nitrate equal?
    • 8. If you had 2.3 grams of aluminum, how many atoms would it contain?
    • 9. If you had 3.4 x 10 34 atoms of tungsten(V) arsenate, how many moles would you have? How many grams?