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Mathematics 9 Online
OpenStudy (anonymous):

Calculate the average atomic mass of an unknown element that has two naturally-occurring isotopes. The first isotope occurs 75.47% of the time and has a mass of 248.7 a.m.u. The second isotope occurs 24.53% of the time and has a mass of 249.4 a.m.u.

OpenStudy (primeralph):

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