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Enumeration of Matter

This lesson begins by recounting the difficulty with counting the number of particles in chemistry. Following this, the rationale for using the mole is carefully explained along with the concept of molar mass (the mass of a single mole of any one substance). The second part of the video refreshes students about the relationship between mass, molar mass, and moles, and empowers them to solve for unknown values when required. As well, students are reminded that the number of moles is equivalent to the number of particles divided by Avogadro’s number. We can then substitute the number of moles into the first formula if required, to find grams or to solve for molar mass experimentally.

Learning Goals:

  • To define the mole as the unit of measure of the amount of a substance
  • To express an amount of a substance in moles
Related Textbook Pages:

Quantum Chemistry, Third Year of Secondary Cycle Two, Chenelière Éducation, 2011, pp 13-14

Observatory: The Environment, Second Year of Secondary Cycle Two, ERPI, 2009, pp 30-31

Additional Resources:
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