No of electrons present in Mg having m=(-1 )
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(i) 9.11 × 10-28 g is the mass of 1 electron
No. of electrons 1 g of mass = = 0.1099 × 1028
= 1.099 × 1027
(ii) Mass of 1 electron = 9.1 × 10-31 kg
Mass of 6.023 × 1023 electrons
= 6.023 × 1023 × 1.6 × 10-31 g
= 5.48 × 10-7 kg
Charge of one electron = 1.6 × 10-19 coulomb
Charge of 6.023 × 1023 electrons
= 6.023 × 1023 × 1.6 × 10-19
= 9.65 × 104C.
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