Question

How do you balance `FeO_3(s) + CO(g) -> Fe(l) + CO_2(g)`?

Answer 1

`FeO_3 + 3CO -> Fe + 3CO_2`

Explanation:

The transition from carbon monoxide to carbon dioxide uses up one part of oxygen. So to use the three parts of oxygen in `FeO_3` combine with `3` parts carbon monoxide.