Q. The mass of 1 mole of electrons is
A) $9.1 \times 10^{- 28}\ g$
B) 1.008 mg
C) 0.55 mg
D) $9.1 \times 10^{- 27}g$
Explanation
(c)
One mole of electrons$= 6.023 \times 10^{23}$ electrons
Mass of one electron=$9.1 \times 10^{- 28}$g
Mass of one mole of electrons
$= 6.023 \times 10^{23} \times 9.1 \times 10^{- 28}$g
$= 5.48 \times 10^{- 4}$g$= 0.548$ mg
$\approx$ 0.55 mg
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.