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Posted by on Tuesday, September 25, 2012 at 4:54pm.

Re has two natural occuring isotopes 185 Re and 187 Re with an average atomic mass of 186.207 amu. Re is 62.60% 187Re and the atomic mass of 187Re is 186.956 amu. What is the mass of 185 Re

  • Ap Chemistry - , Tuesday, September 25, 2012 at 5:03pm

    (0.6260*186.956) + (1-0.6260)*x = 186.207
    Solve for x.
    Note: if 63.60% is one isotope, the other must be 100-62.60 = ? That's what I used above but changed to fractions instead of percent.

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