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

Explanation

(i) Mass of one electron `= 9.11 xx 10^(-31) kg, " i.e., " 9.11 xx 10^(-31) kg = 1` electron
`:. 1 g " i.e., " 10^(-3) kg = (1)/(9.11 xx 10^(-31)) xx 10^(-13)` electrons = `1.098 xx 10^(27)` electrons
(ii) Mass of one electron `= 9.11 xx 10^(-31) kg`
`:.` Mass of one mole of electrons `= (9.11 xx 10^(-31)) xx (6.022 xx 10^(23)) = 5.486 xx 10^(-7) kg`
Charge on one electron `= 1.602 x 10^(-19)` coulomb
`:.` Charge on one mole of electrons `= (1.602 xx 10^(-19)) xx (6.022 xx 10^(23)) = 9.65 xx 10^(4)` coulombs