Atomic Structure Question 156

Question: The mass of 1 mole of electrons is [Pb. CET 2004]

Options:

A) $ 9.1\times {10^{-28}}g $

B) $ 1.008,mg $

C) $ 0.55,mg $

D) $ 9.1\times {10^{-27}}g $

Show Answer

Answer:

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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