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Explanation:
If 1 e is taken from 4 * 10^20 atoms
then number of e = 4 x 10^20
Since, Q = ne
= (4 x 10^20) x (1.6 x10^-19)
= 64 C
64 C charge in 1kg
then in 1 gram = 64/1000 C
= 0.064
= 6.4 x 10^-2 C
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