Calculate the mass of carbon required to reduce 112 g of iron from iron oxide (3)

Reduction of iron with carbon: 2Fe2O3 + 3C = 4Fe + 3CO2.
1) According to the periodic table, we determine the molar mass of iron: 56.
2) Molar mass of carbon: 12.
3) Find the amount of iron substance. For this, the mass of iron is divided by the molar mass: 112/56 = 2 mol.
4) According to the reaction equation, for 4 mol of iron there is 3 mol of carbon. Then, the amount of carbon substance is: 4 * 2/3 = 2.7 mol.
5) Find the mass of carbon. To do this, we multiply the amount of substance by the molar mass: 2.7 * 12 = 32.4 g – the answer.