giúp em với ạ=(( 2b với 2c thuii

Em tham khảo nha:

\(\begin{array}{l}
b)\\
\% {m_C} = \dfrac{{12 \times 6}}{{233}} \times 100\%  = 30,9\% \\
\% {m_H} = \dfrac{9}{{233}} \times 100\%  = 3,86\% \\
\% {m_O} = \dfrac{{16 \times 6}}{{233}} \times 100\%  = 41,2\% \\
\% {m_{Fe}} = 100 - 30,9 - 41,2 - 3,86 = 24,04\% \\
c)\\
\% {m_{Fe}} = \dfrac{{56}}{{332}} \times 100\%  = 16,87\% \\
\% {m_S} = \dfrac{{32}}{{332}} \times 100\%  = 9,64\% \\
\% {m_O} = \dfrac{{14 \times 16}}{{332}} \times 100\%  = 67,47\% \\
\% {m_H} = 100 - 67,47 - 9,64 - 16,87 = 6,02\% 
\end{array}\)