Question

No of electrons present in Mg having m=(-1 )

Answer 1

(i) 9.11 × 10-28 g is the mass of 1 electron No. of electrons 1 g of mass = = 0.1099 × 1028 = 1.099 × 1027 (ii) Mass of 1 electron = 9.1 × 10-31 kg Mass of 6.023 × 1023 electrons = 6.023 × 1023 × 1.6 × 10-31 g = 5.48 × 10-7 kg Charge of one electron = 1.6 × 10-19 coulomb Charge of 6.023 × 1023 electrons = 6.023 × 1023 × 1.6 × 10-19 = 9.65 × 104C.