Sulfur forms two oxides, the formulas of which are SO2 and SO3. What are the names of these oxides?

Sulfur forms two oxides, the formulas of which are SO2 and SO3. What are the names of these oxides? Which of them has a higher sulfur content?

Sulfur oxide (IV), sulfur oxide (VI).
Given: SO2 and SO3. Find: ω1 (S) – ?, ω2 (S) -?
Decision.
1. Mass fraction of sulfur in SO2.
Mr (SO2) = Ar (S) + 2 • Ar (O) = 32 + 2 • 16 = 64
ω1 (S) = (Ar (S) / Mr (SO2)) • 100% = (32:64) • 100% = 50%
2. Mass fraction of sulfur in SO3.
Mr (SO3) = Ar (S) + 3 • Ar (O) = 32 + 3 • 16 = 80
ω2 (S) = (Ar (S) / Mr (SO3)) • 100% = (32:80) • 100% = 40%
Answer: in SO2 oxide, the mass fraction of sulfur is greater than in SO3 oxide.

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