Em tham khảo nha:
\(\begin{array}{l}
R:Cu\\
{X_1}:CuO\\
{X_2}:CuC{l_2}\\
{X_3}:CuS{O_4}\\
{X_4}:Cu{(OH)_2}\\
CuO + {H_2} \xrightarrow{t^0} Cu + {H_2}O\\
Cu{(OH)_2} \xrightarrow{t^0} CuO + {H_2}O\\
Cu + 2{H_2}S{O_4} \to CuS{O_4} + S{O_2} + 2{H_2}O\\
CuS{O_4} + BaC{l_2} \to CuC{l_2} + BaS{O_4}\\
CuC{l_2} + 2NaOH \to Cu{(OH)_2} + 2NaCl\\
Cu{(OH)_2} + 2HCl \to CuC{l_2} + 2{H_2}O
\end{array}\)