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OpenStudy (anonymous):
calculate the average atomic mas 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.
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OpenStudy (anonymous):
you take the percentages and multiply them by their corresponding mass and then add them all up
OpenStudy (anonymous):
(.7547)x(248.7) + (.2453)x(249.4) = the answer
OpenStudy (anonymous):
248.87?
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