Ta có: \(n_{Zn}=\dfrac{6,5}{65}=0,1\left(mol\right)\)
PTHH:
Zn + H2SO4 ---> ZnSO4 + H2 (1)
H2 + CuO ---to---> Cu + H2O (2)
Theo PT(1): \(n_{H_2}=n_{Zn}=0,1\left(mol\right)\)
Theo PT(2): \(n_{Cu}=n_{H_2}=0,1\left(mol\right)\)
=> \(m_{Cu}=0,1.64=6,4\left(g\right)\)