2H2O \(\xrightarrow[phân]{điện}\) 2H2 + O2 (1)
O2 + S \(\underrightarrow{to}\) SO2 (2)
H2 + CuO \(\underrightarrow{to}\) Cu + H2O (3)
A: SO2
B: Cu
\(n_{H_2O}=\frac{5,4}{18}=0,3\left(mol\right)\)
Theo PT1: \(n_{O_2}=\frac{1}{2}n_{H_2O}=\frac{1}{2}\times0,3=0,15\left(mol\right)\)
Theo Pt2: \(n_{SO_2}=n_{O_2}=0,15\left(mol\right)\)
\(\Rightarrow V_{SO_2}=0,15\times22,4=3,36\left(l\right)\)
Theo PT1: \(n_{H_2}=n_{H_2O}=0,3\left(mol\right)\)
Theo pT3: \(n_{Cu}=n_{H_2}=0,3\left(mol\right)\)
\(\Rightarrow m_{Cu}=0,3\times64=19,2\left(g\right)\)