Answer to Question #163058 in General Chemistry for Dawson

Question

Before arc welding was developed, a displacement reaction involving aluminum and iron(III) oxide was commonly used to produce molten iron (the thermite process). This reaction was used, for example, to connect sections of iron railroad track.

Calculate the mass of molten iron produced when 2.30 kg of aluminum reacts with 19.6 mol of iron (III) oxide.

Answer in scientific notation.

Answer 1

Fe₂O₃ + 2Al $\to$ 2Fe + Al₂O₃

moles of Aluminum = 2300/27 = 85.18 moles

So Fe₂O₃ will act as limiting reactant

and hence 19.6 moles of Fe₂O₃ react with Aluminum to produce 39.2 moles

mass of iron produce = 39.2×56 = 2195.2g