\(CuO+H_2\rightarrow Cu+H_2O\)
0,125___0,125__0,125____
a) \(n_{CuO}=\frac{10}{80}=0,125\left(mol\right)\)
\(n_{H2}=\frac{22,4}{22,4}=1\left(mol\right)\)
Tỉ lệ : \(\frac{n_{CuO}}{hs}< \frac{n_{H2}}{hs}\left(\frac{0,125}{1}< \frac{1}{1}\right)\)
CuO hết, H2 dư
\(\Rightarrow n_{H2\left(dư\right)}=1-0,125=0,875\left(mol\right)\)
\(\Rightarrow m_{H2\left(dư\right)}=0,865.2=1,75\left(g\right)\)
b) \(m_{Cu}=0,125.64=8\left(g\right)\)