How many electrons make up a charge of - 50.0 μc? Express your answer using three significant figures?

The charge on one mole of electrons = 96485 C = 1 Faraday

so if charge is 96485 C the moles of electrons are 1 = 6.023 X 10^23 electrons

if charge is 1 C the number of electrons = 6.023 X 10^23 / 96485

If charge is 50 micro C the number of electrons

= 6.023 X 10^23 X 50 X 10^-6 / 96485

= 3.12 X 10^14 electrons