Final answer:
According to the balanced chemical equation, 5.0 g of iron will produce 0.0894 moles of Fe₃O₄. Conversely, 5.0 g of water will produce 0.277 moles of H₂. Therefore, option A) 2.85g of H₂O are left over is FALSE.
Step-by-step explanation:
According to the balanced chemical equation, 3 moles of Fe react with 4 moles of H₂O to produce Fe₃O₄ and 4 moles of H₂. Given that you have equal masses of iron and water (5.0 g each), the reactant that is in excess will be the one that produces fewer moles of product. Since the mole ratio between Fe and Fe₃O₄ is 3:1, 5.0 g of iron will produce 5.0/55.85 = 0.0894 moles of Fe₃O₄. Conversely, 5.0 g of water will produce 5.0/18.015 = 0.277 moles of H₂. Since the mole ratio between H₂O and H₂ is 4:4, meaning the same number of moles are produced, it is not possible for there to be any water left over (option A is FALSE). Therefore, the correct answer is A) 2.85g of H₂O are left over.