$m_C = 12\ đvC = 1,9926.10^{-23}(gam)$
$\Rightarrow 1\ đvC = \dfrac{1,9926.10^{-23}}{12} = 1,6605.10^{-24}(gam)$
$m_{Zn} = 65\ đvC = 65.1,6605.10^{-24} = 1,079325.10^{-24}(gam)$
Ta có: PTKZn = 65(đvC)
Vậy \(m_{Zn}=1,9926.10^{-23}.65=1,29519.10^{-21}\left(g\right)\)