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Abundance of isotopes

  1. Oct 15, 2007 #1
    Element x has two naturally occurring isotopes. The masses (amu) and % abundance are given. 31x is 35% with mass of 31.16 and 34x is 64% with 34.3 amu's
  2. jcsd
  3. Oct 16, 2007 #2
    i suppose you have to calculate the atomic mass of the element??!! huh

    let's take the example of chlorine, which has two istopes too. Cl-35 and Cl-37, in the ratio of 3:1.

    on average, chlorine atoms have atomic mass of: [(35 * 3) + (37 * 1)] / 4

    similarly, you can calculate the atomic mass of x, if that's what you were asking??!!
  4. Oct 19, 2007 #3


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    Are you familiar with the term 'weighted average'?
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