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Calculating average atomic mass

  1. Sep 28, 2012 #1
    The relative abundance of various isotopes of silicon is as Si(28) = 92.25%, Si(29) = 4.65% and Si(30) = 3.10 % . Calculate the average atomic mass of Silicon.

    Ans : 28.11 u

    Attempt. : I don't know how to start this problem .
     
  2. jcsd
  3. Sep 29, 2012 #2
    0.9225*28 + 0.0465*29 + 0.0310*30 = 28.1085
     
  4. Sep 29, 2012 #3
    Thanx. This holds good for all elements ( to calculate average atomic mass of Isotopes) ?
     
  5. Sep 29, 2012 #4

    Borek

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    Staff: Mentor

    Yes, average atomic mass is always a weighted average.
     
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