Question

how many electon will make a weight of 1 kg

Answer 1

Hi,

$$\begin{gathered} \mathrm{mass}\mathrm{of}\mathrm{electron},\mathrm{m}=9.11\times {10}^{-31}\mathrm{kg} \\ \mathrm{No}.\mathrm{of}\mathrm{electron}\mathrm{in}1\mathrm{kg}=\frac{1}{9.11\times {10}^{-31}}\times 1=1.09\times {10}^{30} \end{gathered}$$