Empirical Formula

Let's determine the molecular formula for skunk spray! High schoolers watch a video to learn how to calculate an empirical formula from given masses. The video then demonstrates how to use mass spectrum results to determine a molecular formula.

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Instructional Ideas

  • Pause video to have viewers work out parts of the problem before watching solution
Classroom Considerations

  • Viewers need to have a good grasp of mass ratios and mole ratios
  • Example uses milligrams and millimoles; be sure learners know how to deal with these units
Pros

  • Video explains the process of finding empirical and molecular formulas step by step
Cons

  • Video quality is poor in some locations
  • At one point, speaker says hydrogen when he should have said sulfur