Why do we use carbon 12 is used in mole concept
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Atoms generally have non null mass deficit which makes their atomic mass non exact. This is not the case with carbon. Carbon has a mass deficit zero. Thus, the atomic mass of carbon 12 isotope is exactly 12 and hence it is used in the definition of mole.
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Carbon-12 is the standard while measuring the atomic masses. Because no other nuclides other than carbon-12 have exactly whole-number masses in this scale.08-Feb-2012
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