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Math Help - Atomic Mass

  1. #1
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    Atomic Mass

    i need help with this problem.

    Bromine has two naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu. The mass of Br-81 is 80.9163 amu, and its natural abundance is 49.31%
    1)Calculate the mass of Br-79 using four sig fig.

    2)Calculate the natural abundance of Br-79.
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  2. #2
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    got the answer
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