Question

Calculate the total mass of 1 mole of electrons.

Answer 1

Step: 1 Calculating the total mass of electrons

$\mathrm{Mass}\mathrm{of}\mathrm{one}\mathrm{electron}=9.11\times {10}^{-31}\mathrm{Kg}$

$$\begin{gathered} \mathrm{Number}\mathrm{of}\mathrm{electrons}\mathrm{in}=6.022\times {10}^{23} \\ 1\mathrm{mole}\mathrm{of}\mathrm{electrons} \end{gathered}$$

$\mathrm{Total}\mathrm{mass}\mathrm{of}\mathrm{electrons}=9.11\times {10}^{-31}\times 6.022\times {10}^{23}\mathrm{Kg}$

$\mathrm{Total}\mathrm{mass}\mathrm{of}\mathrm{electrons}=54.86\times {10}^{-8}\mathrm{Kg}$

Or, $\mathrm{Total}\mathrm{mass}\mathrm{of}\mathrm{electrons}=5.486\times {10}^{-7}\mathrm{Kg}$

Therefore, the total mass of electrons is $5.486\times {10}^{-7}\mathrm{Kg}$.