What is the chemical formula for ammonia?

The chemical formula for ammonia is NH3. This formula indicates that ammonia consists of one nitrogen (N) atom bonded to three hydrogen (H) atoms. Ammonia is a colorless gas with a distinct, pungent odor, and it plays a crucial role in various biological and industrial processes, including its use as a fertilizer in agriculture and as a building block in the synthesis of many nitrogen-containing compounds.

In contrast, other options represent different compounds: CO2 is the formula for carbon dioxide, CH4 denotes methane, which consists of one carbon atom and four hydrogen atoms, and C3H7OH represents propanol, an alcohol with three carbon atoms, seven hydrogen atoms, and a hydroxyl (OH) group. Each of these compounds has unique properties and functions, clearly differentiating them from ammonia.