Gọi oxit KL là M2Ox
\(M2Ox+2xHCl-->2MClx+xH2O\)
\(m_{HCl}=\frac{200.7,3}{100}=14,6\left(g\right)\)
\(n_{HCl}=\frac{14,6}{36,5}=0,4\left(mol\right)\)
\(n_{M2Ox}=\frac{1}{2x}n_{HCl}=\frac{0,2}{x}\left(mol\right)\)
\(M_{M2Ox}=8:\frac{0,2}{x}=40x\)
\(x=2\Rightarrow M_{M2Ox}=80\)
\(\Rightarrow M=64\left(Cu\right)\)
CTHH:CuO