1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: 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


    User Avatar

    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


    User Avatar

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook