How many moles of electrons weigh one kilogram?

Options

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)`

Answer

D

Explanation

`"Mass of" 1 e^(-) = 9.31 xx 10^(-31) kg`
`1kg=(1)/(9.31 xx 10^(-31)xx6.02 xx 10^(23)) = (10^(8))/(9.31 xx 6.023)` .