2Zn + O2 \(\underrightarrow{to}\) 2ZnO (1)
a) \(n_{ZnO}=\frac{10,125}{81}=0,125\left(mol\right)\)
Theo pT1: \(n_{Zn}pư=n_{ZnO}=0,125\left(mol\right)\)
\(\Rightarrow m_{Zn}pư=0,125\times65=8,125\left(g\right)\)
\(\Rightarrow H\%=\frac{8,125}{13}\times100\%=62,5\%\)
b) Sửa ZnO thành Zn thì mới có H2
Zn + H2SO4 → ZnSO4 + H2 (2)
Theo pT2: \(n_{H_2SO_4}=n_{Zn}=0,125\left(mol\right)\)
\(\Rightarrow a=C_{M_{H_2SO_4}}=\frac{0,125}{0,5}=0,25\left(M\right)\)
Theo PT2: \(n_{H_2}=n_{Zn}=0,125\left(mol\right)\)
\(\Rightarrow V=V_{H_2}=0,125\times22,4=2,8\left(l\right)\)
c) Theo Pt2: \(n_{ZnSO_4}=n_{Zn}=0,125\left(mol\right)\)
\(\Rightarrow m_{ZnSO_4}=0,125\times161=20,125\left(g\right)\)
