a) Fe + 2HCl → FeCl2 + H2↑
\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)
b) Theo PT: \(n_{Fe}=n_{H_2}=0,15\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,15\times56=8,4\left(g\right)\)
\(\Rightarrow m_{Cu}=12-8,4=3,6\left(g\right)\)
c) Theo pT: \(n_{HCl}pư=2n_{H_2}=2\times0,15=0,3\left(mol\right)\)
\(\Rightarrow m_{HCl}pư=0,3\times36,5=10,95\left(g\right)\)
\(\Rightarrow m_{ddHCl}pư=\dfrac{10,95}{20\%}=54,75\left(g\right)\)
\(\Rightarrow V_{ddHCl}pư=\dfrac{54,75}{1,14}=48,03\left(ml\right)\)