how many grams of CO are needed to react with 2.90 grams of Fe2O3?

Fe2O3 + 3CO ==> 3CO2 + 2Fe

mols Fe2O3 = grams/molar mass = ?
Using the coefficients in the balanced equation, convert mols Fe2O3 to mols CO
Now convert mols CO to grams CO. gCO = mols CO x molar mass CO