(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.
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
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