Sunday, January 16, 2011

Lesson 19: PERCENT COMPOSITION

  • The percentage by mass of an element in a compound is always the same.
  • To find the pervent by mass, determine the mass of each element present in one mole.
EXAMPLE:
  • Determine the percent by mass of Carbon in Octane (C8H18).
                   Carbon's molar mass multiplied by 8              96 g       =     84%
                   Total molar mass of Octane (C8H18)             114 g


»Loureal Agustin.

posted by chemistry11 @ 9:52 PM

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