### L.35

Posted:

**Sun Apr 08, 2018 10:39 pm**Sodium bromide, NaBr, which is used to produce AgBr for use in photographic lm, can itself be prepared as follows.

Fe + Br2 --> FeBr2

FeBr2 + Br2 --> Fe3Br8

Fe3Br8 + 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 was able to balance these equations but I was confused on how to book solved it. So in order to answer this question, we have to use two molar ratios? Can someone further explain please? Thank you!

Fe + Br2 --> FeBr2

FeBr2 + Br2 --> Fe3Br8

Fe3Br8 + 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 was able to balance these equations but I was confused on how to book solved it. So in order to answer this question, we have to use two molar ratios? Can someone further explain please? Thank you!