\(2M+2H_2O\rightarrow2MOH+H_2\)
0,3<---------------------------0,15 (mol)
\(H_2+CuO\rightarrow Cu+H_2O\)
0,15 <----------0,15 (mol)
\(n_{Cu}=\dfrac{m}{M}=\dfrac{9,6}{64}=0,15\left(mol\right)\)
Ta có: \(n_{Cu}=n_{H_2}=0,15mol\)
\(M_M=\dfrac{m}{n}=\dfrac{11,7}{0,3}=39\left(g/mol\right)\)
Vậy kim loại cần tìm là Kali (K)