Question

how is this substance classified? it has the formula nh₃. image of molecular structures options: a heterogeneous mixture, a compound, an element, a homogeneous mixture

Explanation:

A compound is a pure substance made of two or more different elements chemically bonded together. $\text{NH}_3$ (ammonia) consists of nitrogen and hydrogen atoms chemically combined in a fixed ratio, and the diagram shows identical molecules of this bonded substance. It is not an element (only one type of atom), nor a mixture (no multiple distinct substances present).

Answer:

a compound