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How many moles of electrons weigh one ki...

How many moles of electrons weigh one kilogram?
(Mass of electron `=9.108xx10^(-31)` kg, Avogadro's number `=6.023xx10^(23)`)

A

`( 1)/(9.108 xx 6.022 ) xx 10^(8) `

B

`6.022 xx 10^(23)`

C

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

D

`( 6.02 2)/( 9.108) xx 10^(54)`

Text Solution

Verified by Experts

The correct Answer is:
A
Mass of one electron = `9.108 xx 10^(-31) kg`
Mass of one mole of electrons `= 6.022 xx 10^(23) xx 9.108 xx 10^(-31) ` kg
Now, `6.022 xx 10^(23) xx 9.108 xx 10^(-31) kg` = 1 mole of electrons
`:. 1 kg = ( 1)/( 6.022 xx 10^(23) xx 9.108 xx 10^(-31))`
`= ( 1)/( 6.022 xx 9.108) xx 10^(8) ` moles of electrons
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