a)
gọi \(P_XO_Y\)
áp dụng QTHT ta có
\(V\cdot x=II\cdot y=>\dfrac{x}{y}=\dfrac{II}{V}=>\left\{{}\begin{matrix}x=2\\y=5\end{matrix}\right.\\ =>CTHH:P_2O_5\)
b)
gọi \(Fe_x\left(SO_4\right)_y\)
áp dụng QTHT ta có
\(III\cdot x=II\cdot y=>\dfrac{x}{y}=\dfrac{II}{III}=>\left\{{}\begin{matrix}x=2\\y=3\end{matrix}\right.\)
\(=>CTHH:Fe_2\left(SO_4\right)_3\)