Molar mass of C = 12.0107 g/mol ????   (03/29/2017, 2:35 PM)

Wait, what??

https://www.convertunits.com/molarmass/Carbon

It tells me Molar mass of C = 12.0107 g/mol

I thought that by definition, the Molar mass of C is exactly and precisely 12 g/mol.

 


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03/29/2017, 2:35 PM Molar mass of C = 12.0107 g/mol ????
04/02/2017, 4:21 PM     Re: Molar mass of C = 12.0107 g/mol ????
04/03/2017, 6:36 PM         Re: Re: Molar mass of C = 12.0107 g/mol ????
05/09/2017, 11:16 AM             Re: Re: Re: Molar mass E=Mc2 of C = 12.0107 g/mol ...
05/12/2017, 2:35 PM             Re: Re: Re: Molar mass of C = 12.0107 g/mol ????