Calculate the mass of iron oxide (3) taken by the amount: a) 0.2 mol; b) 3 mol.

Let us calculate what the mass of Fe₂O₃ is equal to if the amount of substance is 0.2 mol.

First, we calculate the molecular weight of the substance Fe₂O вещества.

Mr (Fe₂O₃) = 5 * 56 + 3 * 16 = 112 + 48 = 160

The molar mass of the substance is Fe₂O₃ = 160 g / mol.

Knowing the molar mass of Fe2O3 and the amount of substance equal to 0.2 mol, we find the mass of Fe₂O₃.

160 * 0.2 = 32 g.

Let us calculate what the mass of Fe₂O равна is equal to, if the amount of substance is equal to 3 mol.

160 * 3 = 480 g.

Answer: 0.2 mol Fe₂O₃ corresponds to a mass of 32 g, 3 mol Fe₂O₃ corresponds to a mass of 480 g.