Em tham khảo nha :
\(\begin{array}{l}
{m_C} = 6 \times 1,6726 \times {10^{ - 24}} + 6 \times 1,6748 \times {10^{ - 24}} + 6 \times 9,1094 \times {10^{ - 28}}\\
{m_C} = 2,009 \times {10^{ - 23}}g\\
{m_e} = 6 \times 9,1094 \times {10^{ - 28}} = 5,4656 \times {10^{ - 27}}g\\
\% e = \dfrac{{5,4656 \times {{10}^{ - 27}}}}{{2,009 \times {{10}^{ - 23}}}} \times 100\% \approx 0\%
\end{array}\)