a, - MgO không bị khử bởi H2.
PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)
Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
Theo PT: \(n_{CuO}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{CuO}=0,1.80=8\left(g\right)\)
\(\Rightarrow m_{MgO}=16-8=8\left(g\right)\)
b, Ta có: \(\%m_{CuO}=\%m_{MgO}=\dfrac{8}{16}.100=50\%\)
c, Theo PT: \(n_{Cu}=n_{H_2}=0,1\left(mol\right)\Rightarrow m_{Cu}=0,1.64=6,4\left(g\right)\)