Identify the chemical formula of ammonium hydroxide.

The correct answer is option 1. NH₄OH.

The chemical formula for ammonium hydroxide is NH₄OH. However, it's important to note that this formula represents an idealized representation, not the actual structure of the compound in solution.

Here's a breakdown of the points:

Ammonium hydroxide: This is a solution of ammonia gas (NH₃) in water (H₂O).

Formula (NH₄OH): While commonly used, this formula implies the presence of discrete NH₄⁺ and OH⁻ ions in the solution.

Reality: In actuality, only a small portion of the ammonia reacts with water to form these ions. The majority remains as NH₃ molecules. The equilibrium can be represented as:

NH₃ (aq) + H₂O (l) ⇌ NH₄⁺ (aq) + OH⁻ (aq)

Therefore, NH₄OH is the accepted formula, but it's crucial to understand that it doesn't represent the exact composition of the solution at the microscopic level.