Question

1. Balance this reaction: Fe2O3(s) + C(s) → Fe(s) + CO2(g)

When 4.0 moles of C react with an excess of iron(III) oxide, how many moles of CO2(g) will be produced?

2. For the reaction listed in question 1 (above) how many moles of carbon are needed to completely react with 14.0 moles of iron(III) oxide?

Answer 1

2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)
3 mol 3mol
4 mol x mol
x=4*3/3= 4.0 mol

2Fe2O3(s) + 3C(s) →4 Fe(s) + 3CO2(g)
2 mol 3 mol
14 mol x mol

x=14*3/2= 21.0 mol