Question

calculate the number of electrons constituting one coulomb of charge

Answer 1

We know that charge is quantised.

So, q = n e

According to the question, q = 1 C

1 e = 1.6 x 10 ^-19

n = q / e = 1/(1.6 x 10^-19) = 6.25 x 10^18 electrons

Answer 2

We know that Q=ne 
where Q= Charge
n=Number of electrons
e=Charge of an electron(1.6*10^-19:10 to the power minus 19)
Using this,
1C=n*1.6*10^-19
1/1.6*10^-19=n
10*10^18/1.6=n
6.25*10^18=n
Thus there are 6.25*10^18 electrons in 1C of charge.

Hope you got the answer!