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    Hi can anyone tell me why the relative atomic mass is relative to one-twelfth of the mass of a carbon-12 atom? When it must be carbon-12 atom ?
    Help?
    Thanks


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    (Original post by Lamalam)
    Hi can anyone tell me why the relative atomic mass is relative to one-twelfth of the mass of a carbon-12 atom? When it must be carbon-12 atom ?
    Help?
    Thanks


    This was posted from The Student Room's iPhone/iPad App
    It is just a standard decided on by the IUPAC so that everybody in the world can communicate. Previously it has also been O-16 and H-1...
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    (Original post by Lamalam)
    Hi can anyone tell me why the relative atomic mass is relative to one-twelfth of the mass of a carbon-12 atom? When it must be carbon-12 atom ?
    Help?
    Thanks


    This was posted from The Student Room's iPhone/iPad App
    A twelth of the mass of carbon-12 is the mass of a proton or a neutron. Therefore if you compare relative atomic masses's to a twelth of the mass of carbon-12 atoms, it will give you information on the number of protons and/or neutrons that an atom contains.
 
 
 
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