Help! Thanks! chemistry homework

Question

2 NH₃  +  3 CuO   g  3 Cu  +  N₂  +   3 H₂O

In the above equation how many moles of water can be made when 91 moles of NH₃ are consumed?

Answer 1

Multiply the moles of NH₃ by the moles of water/ mole of N₃ from the reaction statement: 3H₂O/2NH₃.