\(n_{H_2}=\dfrac{1,12}{22,4}=0,05mol\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
0,05 0,05
\(m_{Zn}=0,05\cdot65=3,25\left(g\right)\)
\(\Rightarrow m_{Cu}=6,45-3,25=3,2\left(g\right)\)
Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
PTHH: Zn + 2HCl ---> ZnCl2 + H2
Cu + HCl ---x--->
Theo PT: \(n_{Zn}=n_{H_2}=0,05\left(mol\right)\)
=> \(m_{Zn}=0,05.65=3,25\left(g\right)\)
mCu = 6,45 - 3,25 = 3,2(g)