Em tham khảo nha:
\(\begin{array}{l}
*Ca{(HS{O_3})_2}\\
\% {m_{Ca}} = \dfrac{{40}}{{202}} \times 100\% = 19,8\% \\
\% {m_H} = \dfrac{2}{{202}} \times 100\% = 0,99\% \\
\% {m_S} = \dfrac{{32 \times 2}}{{202}} \times 100\% = 31,68\% \\
\% {m_O} = 100 - 19,8 - 0,99 - 31,68 = 47,53\% \\
*Ca{(HP{O_4})_2}\\
\% {m_{Ca}} = \dfrac{{40}}{{232}} \times 100\% = 17,24\% \\
\% {m_H} = \dfrac{2}{{232}} \times 100\% = 0,86\% \\
\% {m_P} = \dfrac{{31 \times 2}}{{232}} \times 100\% = 26,72\% \\
\% {m_O} = 100 - 17,24 - 0,86 - 26,72 = 55,18\% \\
*{(N{H_4})_2}S{O_4}\\
\% {m_N} = \dfrac{{14 \times 2}}{{132}} \times 100\% = 21,21\% \\
\% {m_H} = \dfrac{8}{{132}} \times 100\% = 6,06\% \\
\% {m_S} = \dfrac{{32}}{{132}} \times 100\% = 24,24\% \\
\% {m_O} = 100 - 21,21 - 6,06 - 24,24 = 48,49\%
\end{array}\)
