Question

Calculate the number of electrons which will together weigh one gram.

Answer 1

Mass of electron = 9.1 x 10^-31 kg = 9.1 x 10^-28 g

∴ 9.1 x 10^-28 g = 1 electron

or, 1 g = {1 electron x 1 g}/{9.1 x 10^-28 g} 

= 1.099 x 10²⁷ electron