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Mathematics 11 Online
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.

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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