\(n_{H_2}=\dfrac{9}{18}=0,5\left(mol\right);n_{Fe_2O_3}=\dfrac{1,6}{160}=0,01\left(mol\right);n_{CuO}=\dfrac{a}{80}\left(mol\right)\)
PTHH: \(Fe_2O_3+3H_2\xrightarrow[]{t^o}2Fe+3H_2O\)
0,01--------------->0,02--->0,03
\(CuO+H_2\xrightarrow[]{t^o}Cu+H_2O\)
\(\dfrac{a}{80}\)------------>\(\dfrac{a}{80}\)---->\(\dfrac{a}{80}\)
=> \(0,03+\dfrac{a}{80}=0,5\)
=> a = 37,6 (g)
b) \(n_{Cu}=\dfrac{37,6}{80}=0,47\left(mol\right)\)
=> \(\left\{{}\begin{matrix}\%m_{Fe}=\dfrac{0,02.56}{0,02.56+0,47.64}=3,6\%\\\%m_{Cu}=100\%-3,6\%=96,4\%\end{matrix}\right.\)