Some Basic Concepts Of Chemistry Question 133
Question: How many moles of electron weigh one kilogram?
Options:
A) $ 6.023\times 10^{23} $
B) $ \frac{1}{9.108}\times 10^{31} $
C) $ \frac{6.023}{9.108}\times 10^{54} $
D) $ \frac{1}{9.108\times 6.023}\times 108 $
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Answer:
Correct Answer: D
Solution:
[d] Mass of one electron $ =9.108\times {10^{-31}},kg $
1 kg contain $ =\frac{1}{9.108\times {10^{-31}}} $ electron $ =\frac{1}{9.108\times {10^{-31}}}\times \frac{1}{6.023\times 10^{23}} $ moles of electron or
$ \frac{1}{9.108\times 6.023}\times 10^{8} $ moles
