What are the masses of sulfur and oxygen required to obtain 20 g of sulfur dioxide?

The reaction of obtaining sulfur dioxide:
2S + 3O2 = 2SO3.
1) Find the molar mass of sulfur dioxide according to the periodic table: 32 + 16 * 3 = 80.
2) Find the amount of sulfur dioxide substance: 20/80 = 0.25 mol.
3) According to the reaction equation, there are two moles of sulfur for two moles of sulfur dioxide. This means that the amount of sulfur substance is 0.25 mol.
4) The mass of sulfur is: 0.25 * 32 = 8g – answer 1.
5) According to the reaction equation, there are three moles of oxygen for two moles of sulfur dioxide. This means that the amount of oxygen substance is: 2 * 0.25 / 3 = 0.17 mol.
6) The mass of oxygen is: 0.17 * 16 = 2.72 g – answer 2.