a, \(n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\)
\(n_{H_2SO_4}=\dfrac{29,4}{98}=0,3\left(mol\right)\)
PT: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
Xét tỉ lệ: \(\dfrac{0,2}{1}< \dfrac{0,3}{1}\), ta được H2SO4 dư.
Theo PT: \(n_{H_2SO_4\left(pư\right)}=n_{Fe}=0,2\left(mol\right)\Rightarrow n_{H_2SO_4\left(dư\right)}=0,3-0,2=0,1\left(mol\right)\)
\(\Rightarrow m_{Fe}=0,1.98=9,8\left(g\right)\)
b, \(n_{H_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow n_{H_2}=0,2.22,4=4,48\left(l\right)\)
c, \(n_{CuO}=\dfrac{24}{80}=0,3\left(mol\right)\)
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Xét tỉ lệ: \(\dfrac{0,3}{1}>\dfrac{0,2}{1}\), ta được CuO dư.
Theo PT: \(n_{Cu}=n_{H_2}=0,2\left(mol\right)\Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)