20% oleum means that in 100 kg oleum, there are 20 kg of_____________________?
Correct answer: D. SO3 and 80kg of H2SO4
- A. None of these
- B. H2SO4 and 80kg of SO3
- C. SO3 for each 100 kg of H2SO4
- D. SO3 and 80kg of H2SO4
Explanation
A 20% oleum contains 20 kg of free SO₃ in every 100 kg of oleum, with the remaining 80 kg treated as H₂SO₄ in this convention. Oleum is sulfuric acid containing dissolved excess sulfur trioxide.
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