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Which of one of these are balanced? Please explain. I'll give brainliest.

1. 3 Al + 2 O2 = 3 Al2 O3
2. 4 NH3 + 5 O2 = 4 NO + 6 H2O
3. 2 Fe S + 7 O2 = Fe2 O3 + 2 SO2