\(\overset{\left(II\right)}{Ca_x}\overset{\left(III\right)}{\left(PO_4\right)_y}\\Ápdụngquytắchóatrị\Rightarrow II.x=III.y\\ \Rightarrow\dfrac{x}{y}=\dfrac{3}{2}\\ \Rightarrow CT:Ca_3\left(PO_4\right)_2\)
Gọi CTHH là: \(\overset{\left(II\right)}{Ca_x}\overset{\left(III\right)}{\left(PO_4\right)_y}\)
Ta có: \(II.x=III.y\)
\(\Leftrightarrow\dfrac{x}{y}=\dfrac{III}{II}=\dfrac{3}{2}\Leftrightarrow\left\{{}\begin{matrix}x=3\\y=2\end{matrix}\right.\)
Vậy CTHH là: Ca3(PO4)2