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) -?
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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