Question

How many electrons are contained in1.0C? What is the mass of the electron in 1.0C of charge?

Answer 1

(a) We can find the number of the electrons in 1.0 C as follows:

$$Q=Ne,$$ $$N=\dfrac{Q}{e}=\dfrac{1.0\ C}{1.6\cdot10^{-19}\ C}=6.25\cdot10^{18}\ electrons.$$

(b)

$$m=m_eN=9.1\cdot10^{-31}\ kg\cdot6.25\cdot10^{18}\ electrons=5.7\cdot10^{-12}\ kg.$$