Joane Ihde
Monday, August 15, 2011
C-12 & C-13 are naturally-occurring isotopes of the element carbon.C-12 occurs 98.89% of the time and C-13?
a href="http://www.chemteam.info/Mole/AverageAtomicWeight.html" rel="nofollow"http://www.chemteam.info/Mole/AverageAto…/a
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