Question

The mass and charge of one mole of electrons, respectively is:

• A. $54.8\times {10}^{-7}Kg;9.65\times {10}^4$ C
• B. $5.48\times {10}^{-7}Kg;9.65\times {10}^3$ C
• C. $5.48\times {10}^{-7}g;9.65\times {10}^4$ C
• D. $5.48\times {10}^{-7}Kg;9.65\times {10}^4$C

Answer 1

The correct option is D $5.48\times {10}^{-7}Kg;9.65\times {10}^4$C

One mole of electrons corresponds to $6.023\times {10}^{23}$ electrons.

Mass of one electron is $9.1\times {10}^{-31}$ kg.

Charge of one electron is $1.6\times {10}^{-19}$ Coulomb.

The mass of one mole of electrons is :

$6.023\times {10}^{23}\times 9.1\times {10}^{-31}Kg=$ $5.48\times {10}^{-7}Kg$

The charge of one mole of electrons is:

$6.023\times {10}^{23}\times 1.6\times {10}^{-19}$Coulomb $=$ $9.65\times {10}^4$ Coulomb

Hence, option D is correct.