(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`
`:. 9.11 xx 10^(-31) kg = 1` electron
`1g "or" 10^(-3)g = 1/(9.11 xx 10^(-31)) xx 10^(-3)` electrons
`=1.098 xx 10^(27)` electrons
(ii) Mass of one electron = `9.11 xx 10^(-31) kg`
Mass of 1 mol 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 xx 10^(-19)C`
Charge of 1 mol of electrons
`=1.602 xx 10^(-19) xx 6.022 xx 10^(23)` Coulombs
`= 9.647 xx 10^4 C`.