In level 1, you balanced the equation N2 + H2 → NH3. What number did you place in front of ammonia (NH3)?

N₂ has 2 nitrogen atoms, so place a 2 in front of NH₃ to make 2 nitrogen atoms on the product side. This gives 6 hydrogen atoms in the products, balanced by placing 3 in front of H₂; the number in front of ammonia is 2.

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