Calculate the number of electrons constituting one coulomb of charge

Question 3:

Calculate the number of electrons constituting one coulomb of charge. 

Solution:

We know that the a electron have charge of 1.6 × 10⁻¹⁹ C

∴ e =1.6 × 10⁻¹⁹C

Total charge required 1Coulomb.

∴ q = 1C

Since q=ne

⇒ n =q/e

⇒ n =  1/1.6 × 10⁻¹⁹

⇒6.25×10¹⁸

⇒6×10¹⁸ electrons.