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The mole: why is carbon-12 used instead of hydrogen atom?
When calculating the relative atomic mass or relative molecular mass, the mass of one molecule/atom of the substance is always compared to 1/12 of the mass of one atom of carbon-12 instead of one hydrogen atom. Why is it so?
2 Answers
- NikhileshLv 78 years agoFavorite Answer
The answer is historically the standard for Ar scale was hydrogen. As the lightest element it was given Ar=1. Carbon-12 is used now because it is easier to handle than gaseous hydrogen and is an abundant isotope
- Anonymous5 years ago
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