Ammonia, whose chemical formula is NH3, is a colorless liquid at room temperature. It has a strong odor. It is used in many products because it is a good cleaning agent. It can also be used in fertilizers. Which statement best describes the composition of ammonia? NH3 is a compound containing atoms of nitrogen and hydrogen. NH3 is a compound that contains 4 identical atoms. NH3 is an element with nitrogen in the atom's nucleus and hydrogen outside the nucleus. NH3 is an organic compound composed of long chains of nitrogen atoms surrounded by hydrogen atoms.