What mass and amount of sulfur must be burned to get 6.4 g of sulfur (IV) oxide?

Decision:
1. Let’s compose the reaction equation for obtaining sulfur oxide:
S + O2 = SO2;
2. Let’s calculate the molecular weight of sulfur oxide:
32 + 16 * 2 = 32 + 32 = 64 g / mol.
3. Find the amount of substance in sulfur oxide, dividing the mass by molecular weight:
6.4 / 64 = 0.1 mol.
4. Oxide and sulfur are preceded by the same coefficient. This means that the amount of substance in sulfur is 0.1 mol.
5. Let’s find the mass of sulfur:
0.1 * 32 = 3.2 grams
Answer: you need to burn 3.2 grams of sulfur, the amount of which is 0.1 mol.