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

Options

A. `6.022 xx 10^(23)`
B. `1/(9.108) xx 10^(21)`
C. `(6.022)/(9.108) xx 10^(24)`
D. `1/(9.108 xx 6.022) xx 10^(8)`

Answer

D

Explanation

Mass of 1 mol of electron `=9.108 xx 10^(-31) xx 6.02 xx 10^(23)` kg
1 kg of electrons `=1/(9.108 xx 6.02) xx 10^(8)` mol