Question

If one mole of iron (III) oxide is needed to react with three moles of carbon monoxide (CO) in a reaction to produce two moles of iron and three moles of carbon dioxide, what is the mole ratio between the reactants?

1:2

2:1

2:3

1:3

Answer 1

The reactants are Iron Oxide and Carbon monoxide. The molar ratio between them is 1:3 

Answer 2

The mole ratio over here would be 1 : 3