Question

The mass of 1 mole of electrons is

• A. $9.1 \times 10^{- 28}g$
• B. $1.008mg$
• C. $0.55mg$
• D. $9.1 \times 10^{- 27}g$

Answer 1

Answer: (C)

$0.55mg$

Answer 2

One mole of electron = 6.023 × 10²³ electron

Mass of one electron = 9.1 × 10^–28 gm

Mass of one mole of electrons

= 6.023 × $10^{23} \times 9.1 \times 10^{- 28}gm$ = $5.48 \times 10^{- 4}gm$

= $5.48 \times 10^{- 4} \times 1000mg$ = $0.548gm \approx 0.55mg$.