Write the molecular formula of sulfur oxide in which the mass ratios of sulfur and oxygen are 1: 1, respectively.

Decision:
1. Let’s designate: m – molecular weight of sulfur oxide, x – number of sulfur atoms, y – number of oxygen atoms.
2. In the substance, 50% is sulfur, 50% is oxygen.
3. The relative atomic mass of oxygen is 16, sulfur is 32.
4. Let’s compose the following expressions:
0.5 = (32 * x) / m;
0.5 = (16 * y) / m;
5. Let’s express the molecular weight:
m = (32 * x) / 0.5 = 64x;
m = (16 * y) / 0.5 = 32y;
Equating expressions: 64x = 32y. Therefore: x = 1, y = 2. The formula for sulfur oxide is SO2.
Answer: the molecular formula is SO2.