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OpenStudy (anonymous):
Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%) and C-13 (natural abundance is 1.07%). How many C-13 atoms are present, on average, in a 30000-atom sample of carbon?
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OpenStudy (aaronq):
C-13 (natural abundance is 1.07%) so out of 3000 atoms 1.07% are C-13 1.07%=0.0107, so 3000*0.0107= 32.1 atoms are C-13
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