Question

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Answer 1

8.

\(a.CuO+2HCl\rightarrow CuCl_2+H_2O\\ Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

\(n_{HCl}=0,2.3,5=0,7mol\\ n_{CuO}=a,n_{Fe_2O_3}=b\\ \Rightarrow\left\{{}\begin{matrix}80a+160b=20\\2a+6b=0,7\end{matrix}\right.\\ \Rightarrow a=0,05;b=0,1\\ \%m_{CuO}=\dfrac{0,05.80}{20}\cdot100=20\%\\ \%m_{Fe_2O_3}=100-20=80\%\\ b.n_{CuCl_2}=n_{CuO}=0,05mol\\ n_{FeCl_3}=0,1.2=0,2mol\\ m_{muối}=0,05.135+0,2.162,5=39,25g\)

Answer 2

  

Answer 3

\(9.\\ \left(a\right)Al_2O_3+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2O\\ CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(\left(b\right)n_{H_2SO_4}=0,25.2=0,5mol\\ n_{Al_2O_3}=a;n_{CuO}=b\\ \Rightarrow\left\{{}\begin{matrix}102a+80b=26,2\\3a+b=0,5\end{matrix}\right.\\ \Rightarrow a=0,1;b=0,2\\ \%m_{Al_2O_3}=\dfrac{0,1.102}{26,2}\cdot100=38,93\%\\ \%m_{CuO}=100-38,92=61,07\%\)