\(\left\{{}\begin{matrix}m_{Fe}=1,68g;M_{Fe}=56g\\SốmolFe.n_{Fe}=\dfrac{n}{M}=\dfrac{1,68}{56}=0,03mol\end{matrix}\right.\)
Pt: \(Fe+CuSO_4\rightarrow FeSO_4+Cu\downarrow\)
\(0,03mol\rightarrow0,03mol\)
\(\left\{{}\begin{matrix}n_{Cu\downarrow}=0,03mol;M_{Cu}=64\\\Rightarrow khốilượngCu.m_{Cu}=n.M=0,03.64=1,92\left(gam\right)\end{matrix}\right.\)
PTHH: \(Fe+CuSO_4\rightarrow FeSO_4+Cu\downarrow\)
Ta có:\(n_{Fe}=\dfrac{1,68}{56}=0,03\left(mol\right)\)
=> \(n_{Cu}=n_{Fe}=0,3\left(mol\right)\\ \rightarrow m_{Cu}=0,3.64=19,2\left(g\right)\)