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How many moles of electrons weigh 1 kg?...

How many moles of electrons weigh `1 kg`?

A

`6.023 xx 10^(23)`

B

`(1)/(9.108) xx 10^(31)`

C

`(6.023)/(9.108) xx 10^(54)`

D

`(1)/(9.108 xx 6.023) xx 10^(8)`

Text Solution

Verified by Experts

The correct Answer is:
D
Mass of an electron = `9.108 xx 10^(-31) kg`
`because 9.108 xx 10^(-31)kg = 1.0 "electron"`
`:. 1kg = (1)/(9.108 xx 10^(-31))"electrons" = (10^(31))/(9.108) xx (1)/(6.023 xx 10^(23))`
`= (1)/(9.108 xx 6.023) xx 10^(8)` mole of electrons
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