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



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