1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Isotopes, atomic mass, abundance

  1. Jun 8, 2016 #1
    1. The problem statement, all variables and given/known data
    Suppose the element A contains three isotopes, 86A (atomic mass 85.909 u, abundance 16.19%) 87A (atomic mass 86.908, abundance 7.00%) and 88A (atomic mass 87.906 u). What would be the atomic mass of A that would appear in the periodic table?

    2. Relevant equations
    (A1 x %A1) + (A2 x %A2) + (A3 x (1-(%1 +%2)) = answer

    3. The attempt at a solution

    16.19% + 7.00% = 23.19%

    100% - 23.19% = 76.81% --> so that would be the 88A abundance % right?

    then I'm confused from there. Please help
     
  2. jcsd
  3. Jun 8, 2016 #2

    mfb

    User Avatar
    2017 Award

    Staff: Mentor

    Sure.
    Just plug everything into the equation you have.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted