Question

Mass of a mole of electrons is

• A. $0.20mg$
• B. $0.02mg$
• C. $0.55mg$
• D. $1.00mg$

Answer 1

The correct option is C $0.55mg$

Mass of one electron is $9.1\times {10}^{-25}mg$
Hence mass of 1 mol of electrons
$=6.022\times {10}^{23}\times 9.1\times {10}^{-25}mg=0.55mg$