Question

The mass of an electron is $9.11\times {10}^{-31}kg$. How many electrons would 1 milligram make?

Answer 1

Mass of electron $=9.11\ast {10}^{-31}$

Then in 1 milligram or in ${10}^{-6}kg$

,no. of electrons= $\frac{{10}^{-6}}{9.11\ast {10}^{-31}}$

$=10.9\ast {10}^{23}$