One electron possesses a charge of 1.6 ×10^{-19}C, i.e., 1.6 ×10^{-19}C of charge is contained in 1 electron.

∴ 1 C of charge is contained in 1/1.6 x 10^{-19} = 6.25 x 10^{18} = 6 x 10^{18}

Therefore, 6 x 10^{18} electrons constitute one coulomb of charge