A) \[9.1\,\,\times \,\,1{{0}^{-28}}\,g\]
B) 1.008 mg
C) 0.55 mg
D) \[9.1\,\,\times \,\,1{{0}^{-27}}\,g\]
Correct Answer: C
Solution :
One mole of electron \[= 6.023 \times 1{{0}^{23}}electron\] Mass of one electron = 9.1 x 10~28 g Mass of one mole of electrons \[=\,\,\,6.023\,\,\times \,\,1{{0}^{23}}\times \,\,9.1\times 1{{0}^{-}}^{28}\,g\] \[=\,\,5.48\,\,\times \,\,1{{0}^{-4}}\,g\] \[=\,\,5.48\times {{10}^{-\,4}}\times \,\,1000\,mg\] \[= \,0.548 g \,\approx \, 0.55 mg\]
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