(i) Calculate the number of electrons which will together weigh one gram. (ii) Calculate the mass and charge of one mole of electrons.

The number of electrons which will weigh 1 g is 1.098 × 1027.
Mass of one mole of electrons is 9.11 × 10-31 × 6.023 × 1023 = 5.486 × 10-7 kg.
Charge of 1 mole of electrons is 1.602 × 10-19 × 6.023 × 1023 = 9.647 × 104 C.