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Chemistry 13 Online
OpenStudy (anonymous):

Calculate the average atomic mass of natural carbon. assume carbon exists as 2 isotopes. C-12 has a relative atomic mass of 12.000u and accounts for 98.89% of all carbon. C-13 has a relative atomic mass of 13.003u and accounts for 1.11% of all carbon. (GRASP)

OpenStudy (wolfe8):

So you will consider how many of each isotope is available. Thus, you will multiply the mass of each isotope with their abundance fraction/percentage. The average will then be the total of those. http://answers.yahoo.com/question/index?qid=20080819030624AAdLFyf

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