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  • 1. Percent Composition
  • 2. Percent Review
    • Any percentage calculation involves a portion/part of the total over the total
  • 3. Review
    • % concentration =
  • 4. Review
    • % concentration =
    Grams of solute Grams of solution
  • 5.
    • % concentration =
    Review Grams of solute Grams of solution X 100
  • 6. Percent Composition
    • The percent by mass of each element found in a compound.
    Mass of element Mass of compound X 100 = percent composition
  • 7. Example
    • Water = H 2 O
  • 8. Example
    • Water = H 2 O
      • 2 hydrogens (mass = 1.0 each)
      • 1 oxygen (mass = 16.0)
  • 9. Example
    • Water = H 2 O
      • 2 hydrogens (mass = 1.0 each)
      • 1 oxygen (mass = 16.0)
    • 2 hydrogens @ 1.0  2 X 1.0 = 2.0
    • 1 oxygen @ 16.0  1 X 16.0 = 16.0
    • Total = 18.0
  • 10. Example
    • Water = H 2 O
    • Mass of oxygen
    • Mass of water
  • 11. Example
    • Water = H 2 O
    • Mass of oxygen
    • Mass of water
    • 16.0
    • 18.0
    X 100 = 89.9 %
  • 12. Recap
    • A percentage is a ratio of part : whole
    • Percent composition is the ratio of an element’s mass to the total mass of the compound
    Mass of element Mass of compound X 100 = percent composition