
By the quantization of electric charge, we have Q=ne
Where,Q is the total charge, n is an integer(number of electrons) and e is the charge on an electron =1.6×10-19 C.
Given, Q=1C
So, n=1/1.6×10-19
=6.25×1018
So, in 1C charge, there are 6.25×1018 electrons.