The grams of carbon monoxide is 148. 68 g
calculation
Fe₂O₃(s) + 3CO (g) → 3 CO₂(g) + 2Fe (s)
Step 1: find the moles of CO
moles = mass÷ molar mass
from periodic table the molar mass of Fe =56 g/mol
moles = 198.5 g÷ 56 g/mol =3.54 moles
Step 2 : use the mole ratio to determine the moles of Co
from given equation Co: Fe is 3: 2
therefore the moles of CO = 3.54 moles x 3/2= 5.31 moles
Step 3 Find mass of Co
mass = moles × molar mass
from periodic table the molar mass of CO = 12+ 16 = 28 g/mol
= 5.31 moles × 28 g/mol = 148.68 g
