Question

necesito balance de estos ejercicios:
FeS2 + O2 -------- Fe2O3 + SO2
KNO3 +K ----------- K2O+n2
sNcl4 +NH3 ---------- SnCl3 + HCl + N2
Ba + NH3 ----------- Ba3N2 + H2
Mg + B2O3 ---------- Mgo + B

Answer 1

4 FeS2 + 11 O2 → 2 Fe2O3 + 8 SO2

2 KNO3 + 10 K →6 K2O + N2

6 SnCl4 + 2 NH3 → 6 SnCl3 + 6 HCl + N2

3 Ba + 2 NH3 →  Ba3N2 + 3 H2

3 Mg + B2O3 → 3 MgO + 2 B