Answer :
1 N2 + 3 H2 = 2 NH3
2 Cu + 1 S = 1 Cu2S
1 Fe2O3 + 1 C = 2 Fe + 1 C (I think you may have written this one incorrectly because it doesn’t make sense)
2 Cu + 1 S = 1 Cu2S
1 Fe2O3 + 1 C = 2 Fe + 1 C (I think you may have written this one incorrectly because it doesn’t make sense)