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In the reaction 4 NH₃ (g) + 5 O₂ (g) → 4 NO(g) + 6 H₂O(l) When 1 mole of ammonia and 1 mole of O₂ are made to react to completion:

1. 1.0 mole of H₂O is produced
2. 1.0 mole of NO will be produced
3. all the oxygen will be consumed
4. all the ammonia will be consumed

Correct answer: all the oxygen will be consumed

Solution

The reaction is limited by the stoichiometric ratio of NH₃ to O₂, which is 4:5. Since only 1 mole of each reactant is present, O₂ is the limiting reagent, and all of it will be consumed before NH₃ is completely used up.

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