The mass of aluminum oxide, which is formed by the interaction of aluminum with 134.4 liters. oxygen.

1.4Al + 3O2 = 2Al2O3 – compounds, aluminum oxide is released;

Calculations of the molar masses of substances:
M (O2) = 32 g / mol;

M (Al2O3) = 101.8 g / mol.

Proportions:
1 mol of gas at normal level – 22.4 liters;

X mol (O2) – 134.4 liters from here, X mol (O2) = 1 * 134.4 / 22.4 = 6 mol.

6 mol (О2) – X mol (Al2O3);

-3 mol -2 mol from here, X mol (Al2O3) = 6 * 2/3 = 4 mol.

Find the mass of the product:
m (Al2O3) = Y * M = 4 * 102.8 = 407.2 g

Answer: Received aluminum oxide weighing 407.2 g