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Relative mass and molar mass

  1. Dec 12, 2015 #1
    Molar mass is the mass of one mole of atoms of the element .

    Relative mass is average mass of one atom of that element compared to 1/12 of mass of one carbon-12 atom

    I don't understand how they are equal. Can someone explain to me please?
     
  2. jcsd
  3. Dec 12, 2015 #2

    Borek

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    Staff: Mentor

    We defined mole in such a way it works.
     
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