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Correct definition of Relative atomic mass

  1. Sep 11, 2011 #1
    1. The problem statement, all variables and given/known data
    Explain what you understand by the term Relative Atomic Mass

    The question is equal to three marks, though i don't think i've put enough for all the marks:

    3. The attempt at a solution

    The mass of an atom relative to one atom of carbon-12.

    I would think thats only equal to one mark, how do i get the other three?
     
  2. jcsd
  3. Sep 11, 2011 #2

    cmb

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    So carbon-12 has a relative atomic mass of 1 (unity) then (viz, relative to itself)?! I'd not give you the one mark! :/
     
  4. Sep 11, 2011 #3
    So how could i get receive the three marks?
     
  5. Sep 11, 2011 #4
    I put: Average mass of an element compared to 1/12th of a carbon-12 atom? Hows that
     
  6. Sep 11, 2011 #5

    Borek

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    Staff: Mentor

    Not bad, but not completely correct either. Relative atomic mass can be relative to any atom, doesn't have to be C-12 - the choice is arbitrary. It was oxygen in the past, it is C-12 now.
     
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