0 0 +1 -2
1)S+2Na → Na2S
0 0 +6 -1
2)S+3F2 → SF6
+3 -2 0 0 +1 -2
3)2Fe2O3+3H2 → 4Fe+3H2O
0 0 +1 -1
4)2Na+H2 → 2NaH
0 0 +1 -2
1)S+2Na → Na2S
0 0 +6 -1
2)S+3F2 → SF6
+3 -2 0 0 +1 -2
3)2Fe2O3+3H2 → 4Fe+3H2O
0 0 +1 -1
4)2Na+H2 → 2NaH