Giải:
Có \(m_C=1,9926.10^{-23}\left(g\right)\)
Mà \(m_C=12đvC\)
\(\Leftrightarrow12đvC=1,9926.10^{-23}\left(g\right)\)
\(\Leftrightarrow1đvC=\dfrac{1,9926.10^{-23}}{12}\left(g\right)\)
\(\Leftrightarrow1đvC=1,6605.10^{-24}\left(g\right)\)
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\(1đvC=\dfrac{1}{12}C=\dfrac{1}{12}.1,9926.10^{-23}=1,6605.10^{-24}\) (g)