Chemistry Isotopes Solution: Carbon has two naturally occurring isotopes: C-12 ...

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Solution: 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 2.1000×104-atom sample of carbon?

Problem

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 2.1000×104-atom sample of carbon?

Solution

From the natural abundances of each carbon isotope, we can conclude that in 1 mole of carbon, 1.07% of it is C–13 while 98.93% is C–12.

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