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

Explanation

Mass of 1 electron = 9.11 `xx 10^(10)kg`
`9.11 xx 10^(28) kg`
Charge of 1 electron = 1.602 `xx 10^(19) C`
1 mole =6.02 `xx 10^(23)`
(i) 9.11 `xx 10^(31) kg ` electron = 1 electron
`(0.001 kg xx 1)/( 9.11 xx 10^(31) kg) = (0.001 xx 10^(4))/( 9.11 xx 10^(27))`
(ii) Charge of 1 mole electron
`=1.602 xx 10^(19) c xx 6.022 xx 10^(23)`
`=96470 C ` charge = 9.647 `xx 10^(4)` C
mass of 1 mole electron
`=5.486 xx 10^(7) kg = 5.486 xx 10^(4) gamma `