The Fe yield is 85%. How many grams of Fe can be obtained from 1 kg of glands?

Let’s execute the solution:
1. Let’s write down the equation, arrange the coefficients:
3Fe3O4 + 8Al = 9Fe + 4Al2O3 – OBP, iron was obtained in industry by the process of aluminothermy;
2. Let’s make the calculations:
M (Fe3O4) = 167.4 g / mol;
M (Fe) = 55.8 g / mol;
3. Let’s convert the mass of scale in grams:
m (Fe3O4) = 1000 g.
Determine the amount of moles of iron oxide by the formula:
Y (Fe3O4) = m / M = 1000 / 231.4 = 4.32 mol.
4. We make the proportion:
4.32 (Fe3O4) – X mol (Fe);
-3 mol -9 mol from here, X mol (Fe) = 4.32 * 9/3 = 12.96 mol.
5. Find the theoretical mass of iron:
m (Fe) = Y * M = 12.96 * 55.8 = 723.16 g.
Practical mass is calculated by the formula:
W = m (practical) / m (theoretical) * 100;
m (practical) = 0.85 * 723.16 = 614.68 g.
Answer: the mass of iron is 614.68 g.