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Q.

How many moles of electrons weigh one kilogram?

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a

6.023 x 1023

b

19.108×1031

c

6.0239.108×1054

d

19.108×6.023×108

answer is D.

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Detailed Solution

∵9.108×10−31kg kg of electrons contain=  =16.023×1023mol ∴1 kg of electron will contain =16.023×1023×9.108×10−31  =16.023×9.108×108mol
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