Ammonia, with the chemical formula NH3, is indeed composed of covalent molecular bonds. Covalent molecular bonds are formed by the sharing of electron pairs between atoms. In the case of ammonia, there is one nitrogen atom and three hydrogen atoms. Each hydrogen atom shares its single valence electron with the nitrogen atom, which has five valence electrons. This forms three covalent molecular bonds between the nitrogen and hydrogen atoms. As a result, ammonia forms a stable molecule with a tetrahedral shape.