## Atomic Mass

One unified atomic mass unit (u) is one-twelfth the mass of the carbon-12 atom. $\begin{aligned} \, u & = \frac{1}{12} \left( \frac{mass \, of \, 1 \, mole \, of \, carbon \, – 12}{avogadro \, ‘s \, number} \right) \\ & = \frac{1}{12} \left( \frac{0.012 \, kg}{6.02 \times 10^{23}} \right) \\ & = 1.6605 \times 10^{-27} \, kg \end{aligned}$ The …