How to solve using Stoichiometry

Question

How many moles of ammonia would be required to react exactly with 0.470 moles of copper(II) oxide in the following chemical reaction? 2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

Answer 1

2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

It takes 2 moles NH₃ to react with 3 moles CuO. We use these mole ratios to answer the question.

0.470 moles CuO x 2 moles NH₃ / 3 moles CuO = 0.313 moles NH₃