What mass of co is needed to react completely with55.0 g of fe2o3(s)+co(g) yield fe(s)+co2(g)?

28.9 g

Explanation:

We know that we will need a balanced equation with masses, moles, and molar masses of the compounds involved.  

Gather all the information in one place with molar masses above the formulas and masses below them.  

:     159.69    28.01

              Fe₂O₃ + 3CO ⟶ 2Fe + 3CO₂

Mass/g:  55.0

1. Use the molar mass of Fe₂O₃ to calculate the moles of Fe₂O₃.

2. Use the molar ratio of CO:Fe₂O₃ to calculate the moles of CO.

3.Use the molar mass of CO to calculate the mass of CO.

the answer is d.) potassium

0.88m hope i am correct : )