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March 28, 2017

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Magnesium has an average atomic mass of 24.3068 amu and has three isotopes: 24Mg(23.985045 amu), 25 Mg (24.985839 amu) and 26 Mg(25.982595 amu) The 26 Mg isotope has an abundance of 11.1%. what are the abundances of the other two isotopes. Please show work

  • CHEM - ,

    isotope 26 = 0.111
    isotope 25 = x
    isotope 24 = 1-x-0.111

    (mass*fraction) + (mass*fraction) + (mass*fraction) = 24.3068
    Solve for x.

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