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CleffedUp
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Homework Statement
The atomic weight of bromine is 79.904. The natural abundance of Br-81 is 49.31%. What is the atomic weight of the only other natural isotope of bromine?
Z = 35
Homework Equations
The answer is 78.92 amu (Br-79) and Br-81 happens to be 80.92 amu.
The Attempt at a Solution
Restated, the problem is: 0.4931y + 0.5069x = 79.904
...which amounts to a linear equation, not a single solution for x.
I feel like either I've overlooked some facts/method to derive y (Br-81 amu), or there's some math maneuvering I've forgotten. Before this semester, I was 12 years removed from a classroom -- I have gotten some practice in, but the latter wouldn't surprise me.
Thanks for taking the time.