American Chemical Society (ACS) Chemistry Practice Exam

Sulfuric acid is a highly important and widely used chemical in various industrial processes, and its correct chemical formula is H2SO4. This formula indicates that one molecule of sulfuric acid is composed of two hydrogen atoms, one sulfur atom, and four oxygen atoms.

Each element in the formula contributes to the properties and behavior of sulfuric acid. The presence of sulfur in the formula relates to its classification as a strong acid due to sulfur's capability to release protons (H+ ions) in solution, which is characteristic of acids. The oxygen atoms are involved in the formation of sulfate ions when sulfuric acid dissociates in solution, further ensuring its strong acidic properties.

In contrast, the other chemical formulas provided correspond to different acids: HCl is hydrochloric acid, HNO3 is nitric acid, and H3PO4 is phosphoric acid. Although all are acids, their chemical structures and properties vary significantly from that of sulfuric acid.