Question

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

• A. $1.50\times {10}^{-31}kg$ $mo{l}^{-1}$
• B. $9.11\times {10}^{-31}kg$ $mo{l}^{-1}$
• C. $5.5\times {10}^{-7}kg$ $mo{l}^{-1}$
• D. $6.02\times {10}^{23}kg$ $mo{l}^{-1}$

Answer 1

Answer: (C)

$5.5\times {10}^{-7}kg$ $mo{l}^{-1}$

Rest mass of an electron is $9.11\times {10}^{-31}kg$.
So, mass of one mole of electron is $9.11\times {10}^{-31}\times 6.023\times {10}^{23}=5.5\times {10}^{-7}kg/mole$