Lesson Worksheet: Percentage Composition from Molecular Formulas Chemistry

In this worksheet, we will practice converting between elemental percentage compositions, empirical formulas, and molecular formulas.

Q1:

What is the empirical formula for a substance that is 46.6% oxygen and 53.4% manganese by mass?

  • AMnO2
  • BMnO3
  • CMnO
  • DMnO34
  • EMnO23

Q2:

What is the empirical formula for a substance that is 32.0% oxygen and 68.0% vanadium by mass?

  • AVO
  • BVO23
  • CVO25
  • DVO2

Q3:

Which of the following compounds has the highest percentage mass of carbon?

  • ACHCHBr2
  • BCHCHF2
  • CCHCH33
  • DCHCl3
  • ECH4

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