Em tham khảo nha :
\(\begin{array}{l}
4)\\
CTHH\,D:{S_x}{O_y}\\
{M_D} = 2{M_{{O_2}}} = 2 \times 32 = 64dvC\\
\% S = \dfrac{{x{M_S}}}{{{M_D}}} \times 100\% = 50\% \\
\Rightarrow x = \dfrac{{64 \times 0,5}}{{32}} = 1\\
\% S = \dfrac{{x{M_S}}}{{{M_D}}} \times 100\% = 50\% \\
\Rightarrow y = \dfrac{{64 \times 0,5}}{{16}} = 2\\
\Rightarrow CTHH:S{O_2}\\
3)\\
CTHH:{M_x}{O_y}\\
\% M = \dfrac{{x{M_M}}}{M} \times 100\% = 70\% \\
\Rightarrow {M_M} = \dfrac{{0,7 \times 160}}{x}\\
x = 2 \Rightarrow {M_M} = 56dvC\\
\Rightarrow M:\text{Sắt}(Fe)\\
\% O = \dfrac{{y{M_O}}}{M} \times 100\% = 30\% \\
\Rightarrow y = \dfrac{{0,3 \times 160}}{{16}} = 3\\
\Rightarrow CTHH:F{e_2}{O_3}
\end{array}\)
