Final answer:
The total number of atoms in 2 molecules of NH₃, which is the product of the reaction N₂(g) + 3H₂(g) → 2NH₃(g), is 8 atoms (2 nitrogen and 6 hydrogen atoms).
Step-by-step explanation:
The balanced chemical equation N₂(g) + 3H₂(g) → 2NH₃(g) represents the synthesis of ammonia from nitrogen and hydrogen.
Each molecule of ammonia (NH₃) consists of one nitrogen atom and three hydrogen atoms. Since the balanced equation yields two molecules of NH₃, we ultimately have 2 × 1 = 2 nitrogen atoms and 2 × 3 = 6 hydrogen atoms. Therefore, the total number of atoms in the product (2NH₃) is 2 nitrogen atoms + 6 hydrogen atoms = 8 atoms.
In chemical reactions, mass and the number of atoms must be conserved. It’s important to note that the coefficients in the equation, such as the '2' before NH₃, indicate molecules or moles, not individual atoms.