Mass of a electron cannot be like that. It may be corrected to 9.109 x10^-31 Kg

9.109x10^-31 kg = 9.109/10³¹ kg

= 9.109/10²⁸ g

No. of electrons in g would thus be = 10²⁸ / 9.109

= 1.0978 x10²⁷…… Answer

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