Respuesta :

The fully balanced equation would be 

4Fe + 3O2 --> 2Fe2O3

for each side, we have

4 Fe (4 iron)
6 Oxygen (O)

So the final answer is choice B) 3
AbhiGhost
b.) Balanced equation is : 4Fe + 3O2 ---> 2Fe2O3. So coefficient for O2 is 3.

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