How many moles of nitrogen gas would be produced if 3.40 moles of copper(II)oxide were reacted with excess ammonia in the

Question

How many moles of nitrogen gas would be produced if 3.40 moles of copper(II)oxide were reacted with excess ammonia in the following chemical reaction? 
2 NH3(g) + 3 CuO (s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)

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