Chemistry - Mole Concept Question with Solution | TestHub

Mass of an electron $=9.108\times 10^{-31}\mathrm{kg}$ Mass of one mole of electron $$=\left(9.108\times 10^{-31}\times 6.023\times 10^{23}\right)\mathrm{kg}$$ Then, number of mole of electron in $1\mathrm{kg}$ $$\begin{array}{l}=\frac{1}{9.108\times 6.023\times 10^{-8}}\\ =\frac{1}{9.108\times 6.023}\times 10^8\text{ mole of }{e}^{-}\end{array}$$