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20% oleum means that in 100 kg oleum, there are 20 kg of | |
A. | SO3 and 80kg of H2SO4. [Correct Answer] |
B. | H2SO4 and 80kg of SO3. [Wrong Answer] |
C. | SO3 for each 100 kg of H2SO4. [Wrong Answer] |
D. | none of these. [Wrong Answer] |