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Important Facts For Prelims

Mole Day

  • 24 Oct 2019
  • 2 min read

Mole Day is an unofficial holiday celebrated among chemists, chemistry students and chemistry enthusiasts on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the US date format.

  • The time and date are derived from Avogadro's number, which is approximately 6.02×10 ^ 23, defining the number of particles (atoms or molecules) in one mole of a substance, one of the seven base SI units.
  • The seven base units in the SI system are:
    • the kilogram (kg), for mass
    • the second (s), for time
    • the kelvin (K), for temperature
    • the ampere (A), for electric current
    • the mole (mol), for the amount of a substance
    • the candela (cd), for luminous intensity
    • the meter (m), for distance
  • The day was created to foster an interest in chemistry.

Avogadro's Number

  • The number of particles (atoms, molecules or ions) present in 1 mole of any substance is fixed, with a value of 6.022 × 1023.
  • This is an experimentally obtained value. This number is called the Avogadro Constant or Avogadro Number (represented by N0), named in honour of the Italian scientist Amedeo Avogadro.
  • 1 mole (of anything) = 6.022 × 1023 in number, as, 1 dozen = 12 nos.
  • The Avogadro constant 6.022 × 1023 is defined as the number of atoms in exactly 12 g of carbon-12.
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