A) \[9.1\times {{10}^{-28}}g\]
B) \[1.008\,mg\]
C) \[0.55\,mg\]
D) \[9.1\times {{10}^{-27}}g\]
Correct Answer: C
Solution :
One mole of electron = 6.023 × 1023 electron Mass of one electron = 9.1 × 10?28 gm Mass of one mole of electrons = 6.023 × \[{{10}^{23}}\times 9.1\times {{10}^{-28}}gm\] = \[5.48\times {{10}^{-4}}gm\] = \[5.48\times {{10}^{-4}}\times 1000\,mg\] = \[0.548\,gm\,\approx \,0.55\,mg\].
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