Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent. August 11, 2022 – by admin Question: Conversion of SO2 to SO3 in Monsanto 4-pass converter is about __________ percent. [A]. 80 [B]. 90 [C]. 98 [D]. 100 Answer: Option C Explanation: No answer description available for this question.