Question

The rest mass of an electron is $9.11 \times 10^{-31} kg .$ Molar mass of the electron is:

• A. $1.5 \times 10^{-31}\, kg \, mol ^{-1}$
• B. $9.11 \times 10^{-31} \, kg \, mol ^{-1}$
• C. $5.5 \times 10^{-7} \, kg \, mol ^{-1}$
• D. $6.02 \times 10^{23} \, kg \, mol ^{-1}$

Answer 1

Answer: (C)

Mass of 1 mole of electrons

$=9.11 \times 10^{-31} kg \times 6.02 \times 10^{23} $

$=5.5 \times 10^{-7} \,kg \,mol ^{-1}$