Problem: Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%; mass is 12.0000 amu) and C-13 (natural abundance is 1.07%; mass is 13.0034 amu).Without doing any calculations, determine which mass is closest to the atomic mass of carbon.

FREE Expert Solution

We're asked to determine which mass is closest to the atomic mass of carbon without doing any calculations.


We know that carbon has two naturally occurring isotopes

  • C-12 (natural abundance is 98.93%; mass is 12.0000 amu) and 
  • C-13 (natural abundance is 1.07%; mass is 13.0034 amu).


To do so, we will compare the mass of each isotope to the atomic mass of Carbon


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Problem Details

Carbon has two naturally occurring isotopes: C-12 (natural abundance is 98.93%; mass is 12.0000 amu) and C-13 (natural abundance is 1.07%; mass is 13.0034 amu).

Without doing any calculations, determine which mass is closest to the atomic mass of carbon.

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