What is the total charge of all the electrons in a 13 kg bar of silver? (Silver has 47 electrons per atom and an atomic mass of 108 u.)

Answer 1

6*10^23 silver atoms have a mass of 0.108 kg

n of atoms = 13 kg ( 6*10^23 atoms / 0.108 kg)

n of electrons =47*13*6*10^23/0.108
charge on each electron = 1.6*10^-19 Coulombs
so
charge = 1.6*10^-19*47*13*6*10^23/0.108