On This Day - Oct 23 : Mole Day | Resource - RSC Education

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On This Day – October 23 : Mole Day, the unofficial holiday, was first celebrated on this day in 1991

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Celebrated by chemists annually from 6.02 am to 6.02 pm on October 23rd, Mole Day commemorates Avogadro’s number (6.022 x 1023), which is the number of atoms in exactly 12 grams of carbon-12 (one mole). This was founded by the National Mole Day Foundation on 15th May 1991.

Related resources:

• Avogadro
• Determination of relative atomic mass

Additional information

What happened today in chemistry? Explore 366 days of chemistry history at On This Day in Chemistry.

Image © The Hitman

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Category

• Equations, formulas and nomenclature

Specification

• Scotland
  • Higher
    • SQA Chemistry
      • 3. Chemistry in society
        • (a) Getting the most from reactants
          • numbers of moles
• Northern Ireland
  • A/AS level
    • CCEA Chemistry
      • Unit AS 1: Basic Concepts in Physical and Inorganic Chemistry
        • 1.1 Formulae, equations and amounts of substance
          • 1.1.4 define and demonstrate understanding of the terms Avogadro’s constant, the mole and molar mass;
• Republic of Ireland
  • Leaving Certificate
    • Chemistry
      • 3. Stoichiometry, formulas and equations
        • 3.2 Gas Laws
          • Depth of treatment
            • Avogadro's law.
        • 3.3 The Mole
          • Depth of treatment
            • Avogadro constant.The mole as the SI unit for the amount of substance containing the Avogadro number of particles.
            • Standard temperature and pressure (s.t.p). Molar volume ar s.t.p., molar mass, relative molar mass (Mr).
  • Junior Cycle
    • Science
      • The nature of science
        • Science in society
          • 9. Research and present information on the contribution that scientists make to scientific discovery and invention and its impact on society.
          • 10. Appreciate the role of science in society; and its personal, social and global importance; and how society influences scientific research.

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