Which is the properly balanced equation for the process in which iron oxide (Fe2O3) and carbon monoxide (CO) react to produce iron (Fe) and carbon dioxide (CO2) gas?

A.

Fe2O3 + CO → Fe + CO2

B.

Fe2O3 + 3CO → 2Fe + 3CO2

C.

2Fe2O3 + 3CO → 2Fe + 3CO2

D.

3Fe2O3 + CO → 3Fe + 2CO2

B. Fe2O3 + 3CO - - > 2Fe + 3CO2

Fe has 2, Fe2 - - - > 2Fe

O has 6, O3 + 3O (3+3=6) - - - > 3 (O2) (3x2=6)

C has 3, (3C - - > 3C)

none of the other equations make sense:

In A, Fe on the left has 2 while Fe on the right has 1 (so you can eliminate that.)

in C, Fe on the left has 4 (2x2) while Fe on the right has 2. (eliminate this too.)

in D, Fe on the left has 6 (3x2) and Fe on the right has 3 (eliminate this)