### 7th edition L.35

Posted:

**Sun Oct 07, 2018 11:05 pm**"Sodium bromide, NaBr, which is used to produce AgBr for use in photographic film, can itself be prepared as follows:

Fe + Br2 --> FeBr2

FeBr2 + Br2 --> Fe3Br8

FeBr2 + Na2CO3 --> NaBr + CO2 + Fe3O4

What mass of iron, in kilograms, is needed to produce 2.50 t of NaBr? Note that these equations must first be balanced"

I think I understand the concept of this question and how to solve it but first I am having trouble balancing the third equation: FeBr2 + Na2CO3 --> NaBr + CO2 + Fe3O4. When I try to balance it, I have an extra oxygen in the products.

Fe + Br2 --> FeBr2

FeBr2 + Br2 --> Fe3Br8

FeBr2 + Na2CO3 --> NaBr + CO2 + Fe3O4

What mass of iron, in kilograms, is needed to produce 2.50 t of NaBr? Note that these equations must first be balanced"

I think I understand the concept of this question and how to solve it but first I am having trouble balancing the third equation: FeBr2 + Na2CO3 --> NaBr + CO2 + Fe3O4. When I try to balance it, I have an extra oxygen in the products.