Câu 1
\(Fe+H2SO4-->FeSO4+H2\)
\(n_{H2}=\frac{1,12}{22,4}=0,05\left(mol\right)\)
\(n_{Fe}=n_{H2}=0,05\left(mol\right)\)
\(m=m_{Fe}=0,05.56=2,8\left(g\right)\)
Câu 2
\(2Al+6HCl--.2AlCl3+3H2\)
\(n_{H2}=\frac{0,336}{22,4}=0,015\left(mol\right)\)
\(n_{Al}=\frac{2}{3}n_{H2}=0,01\left(mol\right)\)
\(m_{Al}=0,01.27=0,27\left(g\right)\)
\(m_{Cu}=0,6-0,27=0,33\left(g\right)\)