How many moles of electrons weigh one kilogram?

Options

A. `6.023 xx 10^(23)`
B. `(1)/(9.108)xx10^(31)`
C. `(6.023)/(9.108)xx10^(54)`
D. `(1)/(9.108 xx 6.023)xx10^(8)`

Answer

D

Explanation

1 mole of electron weighs
`= 9.108 xx 10^(-31) xx 6.022 xx 10^(23)kg`
No. of moles of electrons in 1 kg
`= (1)/(9.108xx10^(-31)xx6.022xx10^(23))`
`=(1)/(9.108xx6.022)xx10^(8)`.