Final answer:
When 6 moles of hydrogen react with nitrogen based on the balanced equation N2 + 3H2 → 2NH3, 4 moles of ammonia are produced, as the hydrogen to ammonia mole ratio is 3:2.
Step-by-step explanation:
In the reaction of nitrogen (N2) with hydrogen (H2) to produce ammonia (NH3), according to the balanced chemical equation N2(g) + 3H2(g) → 2NH3(g), the mole ratio of H2 to NH3 is 3:2. This means for every 3 moles of hydrogen, 2 moles of ammonia are produced. If 6 moles of H2 reacted with an equal or excess amount of N2, the reaction would produce 4 moles of NH3 because 6 moles of hydrogen is double the amount required by the stoichiometric 'recipe' where 2 moles would be produced. Therefore, doubling the amount gives us 4 moles of ammonia.