The given example is a chemical reaction.
The contents (separated as reactants and products) :
[tex]\begin{tabular}{c | l}Reactants & Products \\\cline{1-2}Chlorine & Sulfuric Acid \\Water & Hydrochloric Acid \\Sulfur Dioxide & \\\end{tabular}[/tex]
The written reaction is :
[tex]\boxed {Cl + SO_{2} + H_{2}O \implies HCl + H_{2}SO{4}}[/tex]
I hope it helped you solve the problem.
Good luck on your studies!
