Hello!
The atomic mass unit (amu or simply u) is the 1/12 of the mass of a 12C atom.
Avogadro's number (NA=6.022×10^23) is the number of atoms contained in 12g of 12C.
The relation between them is :
1amu = (1/12)*(12/Na) g
Where Na is Avagadro number.
Therefore; 1 amu = (1/Na) g .
Hope this Helped!
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