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Atomic mass: Isotope question

  1. Apr 16, 2005 #1
    How would you go about to solve this quesiton? I thought that to calculate this i had to set up an equation as:

    let x = the percentage of 85-Rb

    84.91*x + 86.91*(1-x) = 85
    x = 96%, but that's obviously wrong.


    How do i solve this question?
     

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  2. jcsd
  3. Apr 16, 2005 #2

    GCT

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    This may work

    [tex] \frac{84.91x+86.91y}{x+y}=85 [/tex]

    solve for [tex]x/y[/tex], or the x in terms of y

    find [tex](100)x/(x+y)[/tex]
     
  4. Apr 16, 2005 #3
    nevermind... i know how to solve it now. It's referring to the actual weight of Rb - 85.
     
  5. Apr 16, 2005 #4

    GCT

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