How many moles of electrons weigh one kilogram?

Options

A. `6.023xx10^(23)`
B. `(1)/(9.108)xx10^(31)`
C. `(6.023)/(9.108)xx10^(54)`
D. `(1)/(9.108xx9.023)xx10^(8)`

Answer

D

Explanation

1 mole of electrons weigh
`=(9.108xx10^(-31)"kg e"^(-1))xx(6.023xx10^(23)"e mol"^(-1))`
`or 9.108xx10^(-31)xx6.023xx10^(23)" kg of electrons"`
`-=" 1 mol of electrons"`
`therefore" 1 kg of electrons"=(1)/(9.108xx6.023)xx10^(8)"mol"`