Lesson Plan: Percentage Composition Chemistry • 10th Grade

This lesson plan includes the objectives, prerequisites, and exclusions of the lesson teaching students how to calculate the percentage composition of a substance using chemical formulas or the masses of constituent elements.


Students will be able to

  • recall the definition of the atomic mass of elements,
  • recall how to calculate the formula mass of a compound,
  • identify the relevant mathematical formula for expressing the mass of a component as a percentage of the total mass,
  • calculate the percentage composition of a compound based on its elemental masses,
  • calculate the percentage by mass of a compound within a substance.


Students should already be familiar with

  • formula mass,
  • chemical formulas.


Students will not cover

  • reaction masses.

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