Lesson: Percentage Composition Chemistry • First Year of Secondary School

In this lesson, we will learn how to calculate the percentage composition of a substance using chemical formulas or the masses of constituent elements.

Lesson Plan

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.