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

Explanation

(i) Mass of one electron `=9.108 xx 10^(-31) kg`
`=9.108 xx 10^(-28)g`
Number of electrons that will together weigh 1g
`=(1)/(9.108 xx 10^(-28))=1.098 xx 10^(27)`
(ii) Number of electrons present in 1 mole of electrons
`=6.022 xx 10^(23)`
Mass of one electron ` =9.1094 xx 10^(-31)kg and `
Charge of one electron `=1.6022 xx 10^(-19)C`
Mass of one mole of electrons
`=9.1094 xx 10^(-31) xx 6.022 xx 10^(23)`
`=5.48 xx 10^(-7)kg`
Charge of one mole of electrons
`=1.6022 xx 10^(-19)xx 6.022 xx 10^(23)`
`=9.65 xx 10^4C`