20% oleum means that in 100 kg oleum, there are 20 kg of_____________________?
(A) SO3 and 80kg of H2SO4
(B) H2SO4 and 80kg of SO3
(C) SO3 for each 100 kg of H2SO4
(D) None of these
20% oleum means that in 100 kg oleum, there are 20 kg of_____________________?
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