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Avogadro's Number

Although early scientists were not able to measure the mass of individual atoms, they searched for a workable method that would allow them to define the mass of an atom. They succeeded when, through the work of Amedeo Avogadro, they were able to define a relative atomic mass unit and develop a relative scale to determine the atomic masses for all the elements.

  • Relative Atomic Mass
    Scientists, using Avogadro’s Law, were able to show that the masses of carbon and hydrogen were in a 1:12 ratio. This relationship between carbon and hydrogen was used to define a relative atomic mass unit.
  • Avogrado's Number
    Avogadro's number (N) is the number of particles in exactly 12.00 grams of carbon. The mole is an Avogadro's number of anything.
  • The Mole
    A mole (mol) is the SI unit for the amount of a substance and is defined as an Avogadro’s number of any representative particle. It is important to remember ...