How many moles of electrons weigh one kilogram?

Options

A. `6.023xx10^(23)`
B. `1/9.108xx10^(31)`
C. `6.023/9.108xx10^(54)`
D. `1/(9.108xx6.023) xx10^(8)`

Answer

D

Explanation

1 mole of electron weight `9.108 xx 10^(-31) xx 6.023 xx 10^(23)kg`
So number of moles of electron in 1 kg is `(1)/(9.108 xx 10^(-31) xx 6.023 xx 10^(23)) = (1)/(9.108xx 6.023) xx10^(8)`