* CTTQ: \(\overset{III}{P_x}\overset{I}{H_y}\)
Theo QTHT ta có:
\(xIII=yI\Leftrightarrow\frac{x}{y}=\frac{I}{III}=\frac{1}{3}\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=3\end{matrix}\right.\)
CTHH: \(PH_3\)
* CTTQ: \(\overset{V}{P_x}\overset{II}{O_y}\)
Theo QTHT ta có:
\(xV=yII\Leftrightarrow\frac{x}{y}=\frac{II}{V}=\frac{2}{5}\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=5\end{matrix}\right.\)
CTHH: \(P_2O_5\)
* CTTQ: \(\overset{III}{Fe_x}\overset{I}{Br_y}\)
Theo QTHT ta có:
\(xIII=yI\Leftrightarrow\frac{x}{y}=\frac{I}{III}=\frac{1}{3}\Leftrightarrow\left\{{}\begin{matrix}x=1\\y=3\end{matrix}\right.\)
CTHH: \(FeBr_3\)
* CTTQ: \(\overset{II}{Ca_x}\overset{III}{N_y}\)
Theo QTHT ta có:
\(xII=yIII\Leftrightarrow\frac{x}{y}=\frac{III}{II}=\frac{3}{2}\Leftrightarrow\left\{{}\begin{matrix}x=3\\y=2\end{matrix}\right.\)
CTHH: \(Ca_3N_2\)