1 atomic Mass unit = \(\frac{1}{12}\) of mass of a6C12 atom,
Mass of 1 mole of 6C12 atom = 12 gm
No. atom in 1 mole = Avogadro number
Mass of 6C12 atom = \(\frac{12}{6.023\times10^{23}}gm\)
1 atomic mass unit = \(\frac{1}{12}\times\frac{12}{6.023\times10^{23}}g\)
= 1.67 × 10−27 gm
