In 1 columb of charge how many no. of electrons are present:

6*10^18   or      6.25*10^18............

 

We know that the charge of an electron, e = 1.6 × 10⁻¹⁹ C

Total charge Q= 1 C

Q = n e,

Where Q is the charge , n the number of electrons and e the charge of an electron.

n = Q / e

= 1 C / 1.6 × 10⁻¹⁹ C

=0.625 × 10 ^-19

= 6.25 × 10¹⁸

Therefore the number of electrons constituting one coulomb of charge = 6.25 × 10¹⁸

On rounding this can be written approximately as 6 × 10¹⁸