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Chemistry - isotpic mass, atomic mass, mass number

  1. Oct 11, 2009 #1
    1. The problem statement, all variables and given/known data

    The two isotopes of antimony have masses 120.90 and 122.90, with a relative abundance of 57.25% and 42.75% respectively. Using these figures, distinguish clearly between atomic mass, isotopic mass, and mass number.

    2. Relevant equations



    3. The attempt at a solution

    I think atomic mass is the relative isotopic abundance which in our case would be

    (0.5725)(120.90) + (.4275)(122.90) = 121.755

    Would isotopic mass be simply 120.90 and 122.90?

    Would mass number be the same as the atomic mass?

    Some how I think I am wrong concerning the last two.
     
  2. jcsd
  3. Oct 14, 2009 #2

    lanedance

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    i think mass number is the total number of protons & neutrons

    the others sound reasonable, but its been a fair while since i've played with this stuff
     
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