a) \(ptpư:\dfrac{2Fe}{x}\dfrac{+}{ }\dfrac{6H_2SO_4}{ }\dfrac{\rightarrow}{ }\dfrac{Fe_2\left(SO_4\right)_3}{ }\dfrac{+}{ }\dfrac{3SO_2}{1,5x}\dfrac{+}{ }\dfrac{6H_2O}{ }\)
\(ptpư:\dfrac{Cu}{y}\dfrac{+}{ }\dfrac{2H_2SO_4}{ }\dfrac{\rightarrow}{ }\dfrac{CuSO_4}{ }\dfrac{+}{ }\dfrac{SO_2}{y}\dfrac{+}{ }\dfrac{2H_2O}{ }\)
b) từ phương trình trên \(\Rightarrow\left\{{}\begin{matrix}56x+64y=15,2\\1,5x+y=0,3\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,15\end{matrix}\right.\)
\(\Rightarrow\%Fe=\dfrac{0,1.56.100}{15,2}\simeq36,8\) và \(\%Cu=\dfrac{0,15.64.100}{15,2}\simeq63,2\)