Ta có:
\(m_{O.trog.X}=20,54.27,26\%=5,6\left(g\right)\)
\(\Rightarrow n_{O.trong,X}=\frac{5,6}{16}=0,35\left(mol\right)\)
Sơ đồ phản ứng:
\(X+H_2SO_4\rightarrow muoi+H_2+H_2O\)
Gọi số mol H2 là x.
Bảo toàn nguyên tố O: \(n_{O.trong.X}=n_{H2O}=0,35\left(mol\right)\)
Bảo toàn nguyên tố H: \(n_{H2SO4}=n_{H2}+n_{H2O}=x+0,35\left(mol\right)\)
BTKL: \(m_X+m_{H2SO4}=m_{muoi}+m_{H2}+m_{H2O}\)
\(\Rightarrow20,54+\left(x+0,35\right).98=52,38+0,35.18+2x\)
\(\Rightarrow x=0,04\)
\(\Rightarrow V=0,04.22,4=0,896\left(l\right)\)