Corban E. answered 11/14/20
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AP Chemistry Tutor and Former Teacher (Gen Chem, High School chem)
2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
3 mol Cu corresponds to 2 mol NH3(ammonia)
0.342 mol CuO /1 * 2molNH3/3molCuO
0.342(2)/3=0.227mol NH3