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 $ .
