Answer:
The answer to your question is 245.9 g of Fe₂O₃
Explanation:
Data
grams of Fe₂O₃ = ?
grams of Fe = 172 g
Balanced chemical reaction
        Fe₂O₃  +  3H₂  ⇒  2Fe  +  3H₂O
Process
1.- Calculate the molar mass of of Iron Oxide and Iron
Fe₂O₃ = (2 x 56) + (3 x 16) = 112 + 48 = 160 g
2Fe = 2 x 56 = 112 g
2.- Use proportions and cross multiplication to solve this problem
         160 g of Fe₂O₃ --------------- 112 g of Fe
           x          ---------------- 172 g of Fe
           x = (172 x 160)/112
           x = 27520/112
           x = 245.9 g of Fe₂O₃
