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Chem help!! I have no clue how to do this!!?

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The atomic weight of rubidium is 85.4678 amu. The two naturally occuring isotopes of rubidium have the following masses: 85Rb, 84.9118 amu; 87Rb, 86.9092 amu. Calculate the percent of 85Rb in naturally occuring rubidium.

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  1. 84.9118x + 86.9092y = 85.4678

    x + y = 1

    Solve the two simultaneous equations.  x is the answer you are after when multiplied by 100.

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