a) \(S\xrightarrow{{ + {O_2},{t^o}}}S{O_2}\xrightarrow[{{V_2}{O_5}}]{{ + {O_2},{t^o}}}S{O_3}\xrightarrow{{ + {H_2}O}}{H_2}S{O_4}\)
\(\xrightarrow{{ + NaOH}}N{a_2}S{O_4}\xrightarrow{{ + BaC{l_2}}}BaS{O_4}\)
b) Các phương trình hóa học:
\(\begin{gathered}
S + {O_2}\xrightarrow{{{t^o}}}S{O_2} \hfill \\
2S{O_2} + {O_2}\xrightarrow[{{V_2}{O_5}}]{{{t^o}}}2S{O_3} \hfill \\
S{O_3} + {H_2}O \to {H_2}S{O_4} \hfill \\
{H_2}S{O_4} + 2NaOH \to N{a_2}S{O_4} + 2{H_2}O \hfill \\
N{a_2}S{O_4} + BaC{l_2} \to BaS{O_4} + 2NaCl \hfill \\
\end{gathered} \)