if 23.1g of iron (iii) oxide is produced, how many moles of oxygen are needed for this reaction

Question

4Fe+3O₂--->2Fe₂O₃

Answer 1

Hi Steve!

Great question. Here we have the amount of product, so we need to calculate how much reactant was used to make that product. Here are the steps:

1. Find the moles of 23.1 grams of iron (III) oxide using the molar mass of iron (III) oxide;
2. Convert the moles of iron (III) oxide to moles of O₂ using the balanced equation. We see that 3 moles of oxygen are need to produce 2 moles of iron (III) oxide.